sheath

Definitions

  • WordNet 3.6
    • n sheath a dress suitable for formal occasions
    • n sheath a protective covering (as for a knife or sword)
    • n sheath an enveloping structure or covering enclosing an animal or plant organ or part
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Webster's Revised Unabridged Dictionary
  • Interesting fact: The banana plant reaches its full height of 15 to 30 feet in about one year. The trunk of a banana plant is made of sheaths of overlapping leaves, tightly wrapped around each other like celery stalks.
    • Sheath A case for the reception of a sword, hunting knife, or other long and slender instrument; a scabbard. "The dead knight's sword out of his sheath he drew."
    • Sheath Any sheathlike covering, organ, or part.
    • Sheath One of the elytra of an insect.
    • Sheath The base of a leaf when sheathing or investing a stem or branch, as in grasses.
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Century Dictionary and Cyclopedia
    • n sheath A case or covering, especially one which fits closely: as, the sheath of a sword. Compare scabbard.
    • n sheath Any somewhat similar covering. In botany, the part of an expanded organ that is rolled around a stem or other body, forming a tube, as in the lower part of the leaves of grasses, the stipules of the Polygonaceæ, the tubular organ inclosing the seta of mosses, etc.; a vagina; also, an arrangement of cells inclosing a cylindrical body, as the medullary sheath. See cuts under Equisetum, exogen, and ocrea.
    • n sheath In zoology, some sheathing, enveloping, or covering part.
    • n sheath () The preputlal sheath into which the penis is retracted in many animals, as the horse, bull, dog, etc. This sheath corresponds in the main with the foreskin of man, and is often called prepuce.
    • n sheath An elytron, wing-cover, or wing-case of an insect.
    • n sheath The horny covering of the bill or feet of a bird; especially, a sort of false cere of some birds, as the sheathbills, jagers, etc. See cuts under puffin.
    • n sheath The lorica or test which envelops many infusorians or other protozoans, some rotifers, etc.
    • n sheath The fold of skin into which the claws of a cat or other feline may be retracted.
    • n sheath In anatomy, specifically, a membrane, fascia, or other sheet or layer of condensed connective tissue which closely invests a part or organ, and serves to bind it down or hold it in place. Such sheaths may be cylindrical, as when investing a nerve or blood-vessel and extending in its course; or flat and expansive, as when binding down muscles. A layer of deep fascia commonly forms a continuous sheath of all the muscles of a limb, as notably in the case of the fascia lata, which envelops the thigh, and is made tense by a special muscle (the tensor fasciæ latæ). See fascia, 7.
    • n sheath A structure of loose stones for confining a river within its banks.
    • n sheath The sheath of a leaf.
    • n sheath Specifically— The membranous toothed girdle which surrounds each node of an Equisetum, corresponding to the foliage of the higher orders of plants. See cut under Equisetum.
    • n sheath The outer leaf becomes thickened about the middle of the internode, inclosing a nucleus.
    • sheath Same as sheathe.
    • n sheath In old plows, the bar connecting the beam and sole in front: so called as sheathing the edge of the mold-board. It corresponds to the standard and in part to the shin (see shin, 8) of a modern plow. See plow, 1.
    • n sheath The white substance of Schwann which surrounds the axis-cylinder in a nerve-fibril.
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Chambers's Twentieth Century Dictionary
    • n Sheath shēth a case for a sword or other long instrument: a scabbard: any thin defensive covering: a membrane covering a stem or branch: the wing-case of an insect
    • ***

Quotations

  • Lord Byron
    Lord%20Byron
    “For the sword outwears its sheath, and the soul wears out the breast. And the heart must pause to breathe, and love itself have rest.”
  • Susan Coolidge
    Susan Coolidge
    “Slow buds the pink dawn like a rose From out night's gray and cloudy sheath; Softly and still it grows and grows, Petal by petal, leaf by leaf.”
  • Proverb
    Proverb
    “No sheath shall hold what finds its home in flesh.”
  • George Herbert
    George%20Herbert
    “One sword keeps another in the sheath.”
  • English Proverb
    English Proverb
    “When the sword of rebellion is drawn, the sheath should be thrown away.”

Etymology

Webster's Revised Unabridged Dictionary
OE. schethe, AS. scǣð, sceáð, scēð,; akin to OS. skēðia, D. scheede, G. scheide, OHG. sceida, Sw. skida, Dan. skede, Icel. skeiðir, pl., and to E. shed, v.t., originally meaning, to separate, to part. See Shed
Chambers's Twentieth Century Dictionary
A.S. scéth, scǽth; Ger. scheide, Ice. skeithir.

Usage

In literature:

Why doth he pluck his poniard from its sheath?
"Rookwood" by William Harrison Ainsworth
He drew it from the sheath, gazing with evident pride at its curving blade of dull blue steel.
"Ahead of the Army" by W. O. Stoddard
Sheath of the femoral vessels and of the hernia.
"Surgical Anatomy" by Joseph Maclise
The tapping quickly showed him where the upright beams were located on the other side of the sheathing.
"Blow The Man Down" by Holman Day
The body had been sheathed in metal that would serve to ward off most of this hail, but despite this they took many chances of a mishap.
"Air Service Boys Flying for Victory" by Charles Amory Beach
The term is now applied to sheathing a vessel with planking over felt.
"The Sailor's Word-Book" by William Henry Smyth
All the species of this section, except P. Nelsonii, have deciduous fascicle-sheaths.
"The Genus Pinus" by George Russell Shaw
Having secured this, he appeared to be quite satisfied, let go, and sheathed his sword.
"An Explorer's Adventures in Tibet" by A. Henry Savage Landor
To the same belt was also attached the sheath of what must have been a long and formidable dagger.
"Dick Leslie's Luck" by Harry Collingwood
I shall not leave it in a sheath, they say, but I shall remove him and destroy the sheath.
"Commentary on Genesis, Vol. II" by Martin Luther
Then he sheathed his sword and waited upon events.
"The Duke's Motto" by Justin Huntly McCarthy
Daoud circled away, sheathing his saif and pulling his bow from its case.
"The Saracen: Land of the Infidel" by Robert Shea
Jewels sparkled on the hilt and sheath of his sword.
"The Saracen: The Holy War" by Robert Shea
Mormon's gun flashed from its sheath as he shouted at the man.
"Rimrock Trail" by J. Allan Dunn
He gripped the hilt of the thirteen-inch knife at his belt and loosened it in its sheath.
"Shaman" by Robert Shea
But what are a sheath-knife and a wooden skewer, if not everything that is needed?
"Brighter Britain! (Volume 1 of 2)" by William Delisle Hay
His sword leaped from its sheath, and with an energy which he seldom needed to exert he braced himself for the struggle.
"Marguerite De Roberval" by T. G. Marquis
He reported that the marks of the grappling-hook in the roof sheathing were unmistakable, too.
"Frances of the Ranges" by Amy Bell Marlowe
On the wall hung an enormous two-edged sword in a sheath of black leather.
"Pretty Michal" by Mór Jókai
None other than such a one may draw this sword from its sheath, for so it is ordained.
"Historic Tales, Vol. XIII (of 15)" by Charles Morris
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In poetry:

I watch Inesilla
Thy window beneath,
Deep slumbers the villa
In night's dusky sheath.
"A Serenade" by Alexander Sergeyevich Pushkin
At times I've seen thy steely eye,
Sheath'd with a look of tender love,
As if thou saw our mortal woes,
And fain would help, but dare not move.
"Happiness" by Thomas Frederick Young
And when the winds of autumn, with a shout,
Tossed its great arms about,
The shining chestnuts, bursting from the sheath,
Dropped to the ground beneath.
"Ultima Thule: From My Arm-Chair" by Henry Wadsworth Longfellow
The day was dying, and with feeble hands
Caressed the mountain-tops; the vales between
Darkened; the river in the meadow-lands
Sheathed itself as a sword, and was not seen.
"Monte Cassino. Terra Di Lavoro. (Birds Of Passage. Flight The Fourth)" by Henry Wadsworth Longfellow
So, in the window's threefold white,
O'ertrailed with foliage like a bower,
She seemed, against the evening light,
Amongst the flowers herself a flower,
A tiger-lily sheathed in white.
"At Glan-y-Wern" by Arthur Symons
They are Sword and Sheath, they are Life and its Shows
Which lovers have grace to see beneath,
When the brow of June is crowned by the rose
And the Earth hath rest from her long birth-throes.
"Villanelle" by Emily Pfeiffer

In news:

Mylene Sheath Joins Redeye .
Sheath knife when it's dark.
MRI on Michael Morse's left wrist shows bone bruise, torn sheath .
It is designed to bend a silicone finger sheath in a realistic manner.
A year ago, Louisiana farmer Kim Frey lost about 20% of his rice yield potential because of sheath blight.
Spectranetics' current laser sheath , the SLS II, requires significantly less force to advance than mechanical telescoping sheaths .
Boston Scientific Launches New EP Guide Sheath .
Z Flex-270 Steerable Sheath allows easier catheter navigation inside the heart.
Boston Scientific Corporation announced the United States market launch of its Z Flex-270 Steerable Sheath .
Sheath cleaning isn't really a fun job for anyone involved.
Plastic- sheathed toilet seats a hit.
The plastic sheath invented by a Pennsylvania physician is marketed to hotel chains as well as individuals.
Anyone wanting a cotton sheath from Banana Republic had to be ready to shell out at least a bill.
Strikeforce champion Miesha "Takedown" Tate views her next opponent as a series of deficiencies sheathed in a veneer of judo flash.
If you take your phone anywhere interesting, it should be sheathed in the LifeProof iPhone Case.
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In science:

Slemrod, KdV dynamics in the plasma-sheath transition, to appear in Appl.
Appendix to paper: A geometric level-set formulation of a plasma-sheath interface
Riemann, The Bohm criterion and sheath formation, J.
Appendix to paper: A geometric level-set formulation of a plasma-sheath interface
Slemrod, Shadowing and the plasma-sheath transition layer, J.
Appendix to paper: A geometric level-set formulation of a plasma-sheath interface
Slemrod, Monotone increasing solutions of the Painleve 1 equation y ′′ = y 2 + x and their role in the stability of the plasma-sheath transition, European J.
Appendix to paper: A geometric level-set formulation of a plasma-sheath interface
Slemrod, The radio-frequency driven plasma sheath: asymptotics and analysis, to appear in SIAM J.
Appendix to paper: A geometric level-set formulation of a plasma-sheath interface
The electric field decreases in the sheath, vary slowly in the plasma and increases again in the anode sheath, although not attaining such high value as in the cathode.
Electron Trapping by Electric Field Reversals in Glow Discharges
All plasmas are separated from the walls (both conducting or non-conducting) by a sheath.
Electron Trapping by Electric Field Reversals in Glow Discharges
This is the presheath , a quasi-neutral region between the plasma and the sheath characterized by small electric fields gradients (usually smaller than 1 V/cm).
Electron Trapping by Electric Field Reversals in Glow Discharges
If electrons were in hydrodynamic equilibrium with the local electric field and were created in the cathode sheath followed by a fast diffusion to the walls and acceleration to the anode, then ions loss would occur through migration to the cathode and it will be no need for field reversal.
Electron Trapping by Electric Field Reversals in Glow Discharges
This situation results from the complex structure embodied in the sheath, pre-sheath and plasma regions (see Ref. for details).
Electron Trapping by Electric Field Reversals in Glow Discharges
As electrons diffuse more rapidly to the walls than ions, the walls along the positive column and near the anode sheath charge negatively, while along the cathode fall they charge positively (see, for example, Ref. ).
Electron Trapping by Electric Field Reversals in Glow Discharges
The highly energetic electron created in the cathode sheath of a DC discharge have kinetic energies well above the first excitation potential ε∗ .
Electron Trapping by Electric Field Reversals in Glow Discharges
Ionization and excitation processes are created by them and they carry the electron current in the sheath and nearby plasma region.
Electron Trapping by Electric Field Reversals in Glow Discharges
The discharge gap is divided in two regions: the sheath and the (quasi-neutral) plasma region.
Electron Trapping by Electric Field Reversals in Glow Discharges
The above equation shows that, by one side, the position of the field reversal x0 depends on the cathode sheath length dc , the gap length L and on the electron energy relaxation length λε .
Electron Trapping by Electric Field Reversals in Glow Discharges
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