• WordNet 3.6
    • n tract a bundle of myelinated nerve fibers following a path through the brain
    • n tract a system of body parts that together serve some particular purpose
    • n tract a brief treatise on a subject of interest; published in the form of a booklet
    • n tract an extended area of land
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: The hypodermic needle was invented in 1853. It was initially used for giving injections of morphine as a painkiller. Physicians mistakenly believed that morphine would not be addictive if it by-passed the digestive tract.
    • Tract A region or quantity of land or water, of indefinite extent; an area; as, an unexplored tract of sea. "A very high mountain joined to the mainland by a narrow tract of earth."
    • n Tract A written discourse or dissertation, generally of short extent; a short treatise, especially on practical religion. "The church clergy at that time writ the best collection of tracts against popery that ever appeared."
    • Tract Continued or protracted duration; length; extent. "Improved by tract of time."
    • Tract Continuity or extension of anything; as, the tract of speech.
    • Tract Something drawn out or extended; expanse. "The deep tract of hell."
    • Tract The footprint of a wild beast.
    • v. t Tract To trace out; to track; also, to draw out; to protact.
    • Tract Track; trace. "Efface all tract of its traduction.""But flies an eagle flight, bold, and forthon,
      Leaving no tract behind."
    • Tract Traits; features; lineaments. "The discovery of a man's self by the tracts of his countenance is a great weakness."
    • Tract Treatment; exposition.
    • Tract (R. C. Ch) Verses of Scripture sung at Mass, instead of the Alleluia, from Septuagesima Sunday till the Saturday befor Easter; -- so called because sung tractim, or without a break, by one voice, instead of by many as in the antiphons.
    • ***
Century Dictionary and Cyclopedia
    • tract To draw; draw out; protract; waste.
    • tract To trace; track; follow.
    • n tract Extent; a continued passage or duration; process; lapse: used chiefly in the phrase tract of time.
    • n tract Course or route; track; way.
    • n tract Course or movement; action.
    • n tract Attractive influence; attraction; charm.
    • n tract Extent; expanse; hence, a region of indefinite extent; a more or less extended area or stretch of land or water: as, a tract of woodland.
    • n tract Trait; lineament; feature.
    • n tract In anatomy, an area or expanse; the extension of an organ or a system: as, the digestive or alimentary tract; the optic tract. Also called tractus (which see).
    • n tract In ornithology, a pteryla, or feathered place: distinguished from space.
    • n tract In heraldry, same as tressure.
    • n tract The air-passages collectively.
    • tract To handle; treat.
    • tract Hence To discourse or treat of; describe; delineate.
    • n tract A short treatise, discourse, or dissertation; especially, a brief printed treatise or discourse on some topic of practical religion.
    • n tract In the Roman and some other Western liturgies, an anthem consisting of verses from Scripture (generally from the Psalms), sung instead of the Alleluia after the gradual, or instead of the gradual, from Septuagesima till Easter eve: so called from being sung ‘continuously’ (tractim) by the cantor without interruption of other voices. Also tractus.
    • n tract Track; footprint.
    • ***
Chambers's Twentieth Century Dictionary
    • n Tract trakt something drawn out or extended: continued duration: a region, area: a short treatise: an anthem sung instead of the Alleluia after the gradual, or instead of it, from Septuagesima till Easter-eve
    • ***


  • Thomas Hobbes
    “War consisteth not in battle only, or the act of fighting; but in a tract of time, wherein the will to contend by battle is sufficiently known.”


Webster's Revised Unabridged Dictionary
L. tractus, a drawing, train, track, course, tract of land, from trahere tractum, to draw. Senses 4 and 5 are perhaps due to confusion with track,. See Trace,(v.), and cf. Tratt
Chambers's Twentieth Century Dictionary
L. tractus, pa.p. of trahĕre, to draw.


In literature:

A tract of three hundred acres, next eastward of the Downing farm, was granted to Thomas Read.
"Salem Witchcraft, Volumes I and II" by Charles Upham
There are very few tracts of treeless land in India which are not tenanted by finch-larks.
"A Bird Calendar for Northern India" by Douglas Dewar
They occupy the tract between Ghat, Tuat, and Timbuctoo.
"Narrative of a Mission to Central Africa Performed in the Years 1850-51, Volume 2" by James Richardson
Lastly, disease is spread by tract distributors.
"Scientific American, Volume XXXVI., No. 8, February 24, 1877" by Various
He added, however, his serious regret at the character of the Tracts.
"Apologia pro Vita Sua" by John Henry Newman
The government owns the land, except tracts here and there suitable for farming.
"David Lannarck, Midget" by George S. Harney
Private owners of large tracts should be compelled to use the same care in preventing fires that is exercised by the government.
"Checking the Waste" by Mary Huston Gregory
In 1911 about 300 Mahlis were returned from the Feudatory States in this tract.
"The Tribes and Castes of the Central Provinces of India - Volume IV of IV" by R.V. Russell
At other times a man would come along and throw tracts in at the gate of the alley.
"An Outcast" by F. Colburn Adams
At Oxford his fervour carried him beyond the fluent tract to a personal decision.
"The Life of William Ewart Gladstone, Vol. 1 (of 3)" by John Morley

In poetry:

Oh! when she blesses next your shade,
Oh! when her footsteps next are seen
In flowery tracts along the mead,
In fresher mazes o'er the green;
"The Lover's Fate" by James Thomson
He flutter'd on through tracts of air,
So sorrowful, he knew not where,
Away from all that once he sought,
He cared not what the roses thought;
"The Butterfly And The Fairies" by Menella Bute Smedley
The Lady of fair weeping,
At the garden's core,
Sang a song of sweet and sore
And the after-sleeping;
In the land of Luthany, and the tracts of Elenore.
"The Mistress Of Vision" by Francis Thompson
'Tis a vision:
Yet the greeneries Elysian
He has known in tracts afar;
Thus the enamouring fountains flow,
Those the very palms that grow,
By rare-gummed Sava, or Herbalimar. -
"Sister Songs-An Offering To Two Sisters - Part The Second" by Francis Thompson
O'er the drear tract of Time, Remembrance views
Some dear, some long-departed, pleasure gleam;—
So o'er the dark expanse the eye pursues
Upon the wat'ry edge a transient beam.
"Lines Written At Brighton" by Sir John Carr
O wond'rous Lord! how bright thy glories shine,
The heav'ns declare, for what they boast is thine:
And yon blew tract, enrich'd with orbs of light,
In all its handy work displays thy might!
"David" by Thomas Parnell

In news:

Rocky suffered from urinary tract infections.
New York State cities like Newburgh, Poughkeepsie and Kingston have seen new battles over long-forgotten tracts.
The Malcolm X festival is a collective effort of Oakland's San Antonio neighborhood that unites one of the most ethnically diverse census tracts in Alameda County. Stop Feline Urinary Tract Problems With a Clean Litter Box.
Mystery Cat Illness Could Be Urinary Tract Infection.
Tt's time to talk about urinary tract problems.
Are drugs for treating urinary tract infections losing effectiveness.
Columnists Health with Dr Levister Blueberries Also Fight Urinary Tract Infections.
Contaminated Chicken May Be Responsible for Urinary Tract Infections.
Urinary-tract infections more abundant in women.
Take step to prevent and treat urinary tract infections in girls.
How common are urinary tract infections in girls.
Girls' Offseason Update: Jemima Kirke Painted Lena Dunham Naked, Mid- Urinary Tract Infection.
Mystery Cat Illness Could Be Urinary Tract Infection .
Urinary tract infection resistant to medication.

In science:

Vainshtein, Theory of the Muon Anomalous Magnetic Moment. (Springer Tracts in Modern Physics, Vol. 216, (Springer, Berlin, 2006).
Why Precision?
Jegerlehner, The anomalous magnetic moment of the muon, Springer tracts in modern physics, volume 226, Springer-Verlag, Berlin-Heidelberg, 2008.
MesonNet Workshop on Meson Transition Form Factors
Ruan, Orbifolds and Stringy Topology, Cambridge Tracts in Math. 171, Cambridge University Press, Cambridge, 2007.
D-manifolds, d-orbifolds and derived differential geometry: a detailed summary
CWI Tract 40, Center for Mathematics and Computer Science, Amsterdam, The Netherlands.
Intermediate Tail Dependence: A Review and Some New Results
Koll´ar, Singularities of the minimal model program, Cambridge Tracts in Mathematics, vol. 200, Cambridge University Press, Cambridge, 2013, with the collaboration of S´andor J.
Some applications of Grothendieck Duality Theorem