decussate
Americanadjective
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in the form of an X ; crossed; intersected.
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Botany. arranged along the stem in pairs, each pair at right angles to the pair next above or below, as leaves.
verb (used without object)
verb
adjective
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in the form of the letter X; crossed; intersected
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botany (esp of leaves) arranged in opposite pairs, with each pair at right angles to the one above and below it
Other Word Forms
Etymology
Origin of decussate
First recorded in 1650–60; from Latin decussātus “divided in the form of an X” (past participle of decussāre ), equivalent to Latin decuss(is) “the numeral ten,” originally, “a ten-as weight,” supposedly from unrecorded dec(-em) assis ); see origin at ten, as 2, -ate 1
Explanation
Decussate things cross over each other, forming an X shape. In botany, decussate leaves are arranged along a stem in a way that causes pairs of them to overlap each other. You can use decussate as an adjective or a verb — either way, it's a technical term most commonly used by scientists. In anatomy, nerve fibers that cross from one side of the brain to the other are said to decussate, and when rods of tooth enamel decussate, they cross each other in an X shape. Biologists also describe animal and plant markings this way: "I saw the decussate lines on its back and immediately identified the insect!"
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
Axons from these second neurons then decussate within the spinal cord and ascend to the brain and enter the thalamus, where each synapses with the third neuron in its respective pathway.
From Textbooks ● Jun. 19, 2013
The major differences between the two are in the type of information that is relayed to the brain and where the tracts decussate.
From Textbooks ● Jun. 19, 2013
However, within each eye, the axons projecting from the lateral side of the retina do not decussate.
From Textbooks ● Jun. 19, 2013
Upon reaching the appropriate level, the axons decussate, entering the ventral horn on the opposite side of the spinal cord from which they entered.
From Textbooks ● Jun. 19, 2013
Thus, leaves normally opposite and decussate may, by fusion, become alternate.
From Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants by Maxwell T. Masters
In his famous dictionary Samuel Johnson notoriously, and gloriously, defined the word “network” as “any thing reticulated or decussated, at equal distances, with interstices between the intersections.”
From Washington Post ● Feb. 17, 2016
A cough, said he, is "a convulsion of the lungs, vellicated by some sharp serosity," and a network is "anything reticulated or decussated, at equal distances, with interstices between the intersections."
From Time Magazine Archive
A net is a reticulated fabric, decussated at regular intervals.
From Deductive Logic by St. George William Joseph Stock
IX., and although the details of the illustration are not clear the text indicates the existence of one heddle: “The warp is decussated by means of a horizontal rod and leashes.”
From Ancient Egyptian and Greek Looms by H. Ling (Henry Ling) Roth
You see they don't know what to make of it; and very likely their legs and wings get caught sometimes in the "decussated, reticulated interstices," as Dr. Johnson calls them.
From Autobiography and Letters of Orville Dewey, D.D. Edited by his Daughter by Mary Elizabeth Dewey
The grey matter of the anterior cornua is cut off from the rest by the decussating pyramids and finally disappears.
From Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4 "Bradford, William" to "Brequigny, Louis" by Various
This arrangement in successive decussating pairs gives an advantageous distribution on the stem in four vertical ranks.
From The Elements of Botany For Beginners and For Schools by Asa Gray
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