decussation

Definitions

  • WordNet 3.6
    • n decussation an intersection or crossing of two tracts in the form of the letter X
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Webster's Revised Unabridged Dictionary
    • n Decussation Act of crossing at an acute angle, or state of being thus crossed; an intersection in the form of an X; as, the decussation of lines, nerves, etc.
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Century Dictionary and Cyclopedia
    • n decussation The act of crossing or intersecting; an intersection; the crossing of two lines, rays, fibers of nerves, etc.
    • n decussation The state of being decussated, or that which decussates; a chiasm.
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Etymology

Webster's Revised Unabridged Dictionary
L. decussatio,

Usage

In literature:

A Melaleuca with very small decussate leaves, a tree about twenty-five feet high, was growing on the scrubby ridges.
"Journal of an Overland Expedition in Australia" by Ludwig Leichhardt
This is a neat, finely-decussated, concolorous species, with the upper whorls nodulous from erosion, as in Vivipara praerosa, Gerst.
"Explorations in Australia, The Journals of John McDouall Stuart" by John McDouall Stuart
Thus, leaves normally opposite and decussate may, by fusion, become alternate.
"Vegetable Teratology" by Maxwell T. Masters
Decussation of nerves, iii.
"Zoonomia, Vol. II" by Erasmus Darwin
The most anterior is the pyramid or motor tract, the decussation of which has been seen.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4" by Various
A decussated cross, on which St. Andrew was crucified, indicates his day.
"Old Church Lore" by William Andrews
Scales of the fertile ament few, decussately opposite or ternate, becoming a small closed cone or sort of drupe.
"The Manual of the Botany of the Northern United States" by Asa Gray
The legs transversed thus X cross-wise, or decussated, was among the ancients the posture of malediction.
"The Works of Charles and Mary Lamb" by Charles Lamb
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In poetry:

Quickly, off stage with all but kindness, now.
I can't say what I have in mind. Bless Frost,
any odd god around.
Gentle his shift, I decussate & command,
stoic deity. For a while here we possessed
an unusual man.
"Dream Song 37: Three around the Old Gentleman" by John Berryman

In science:

It is worth noting that alternate and spiral patterns can coexist in the same plant and that a decussate pattern can turn into a spiral one on a stem: the pattern is sensitive to local influences or noise.
Fibonacci numbers in phyllotaxis : a simple model
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