Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- v. To cross or become crossed so as to form an X; intersect.
- adj. Intersected or crossed in the form of X.
- adj. Botany Arranged on a stem in opposite pairs at right angles to those above or below, resulting in four vertical rows: decussate leaves.
Century Dictionary and Cyclopedia
- To intersect; cross, as lines, rays of light, leaves, or fibers of nerves.
- Crossed; intersected: specifically applied, in bot, to bodies which are arranged in pairs alternately crossing each other at regular angles.
- In rhetoric, arranged in two pairs of repeated, contrasted, or parallelized words or phrases, the second pair reversing the order of the first; characterized by or constituting such an arrangement; chiastic. See chiasmus.
Wiktionary
- adj. Crossed; intersected; resembling a letter X.
- adj. botany Having opposite leaves arranged alternately at right angles.
- adj. rhetoric Consisting of two rising and two falling clauses, placed in alternate opposition to each other.
- v. To form an X or to cross or intersect.
GNU Webster's 1913
- v. To cross at an acute angle; to cut or divide in the form of X; to intersect; -- said of lines in geometrical figures, rays of light, nerves, etc.
- adj. Crossed; intersected.
- adj. (Bot.) Growing in pairs, each of which is at right angles to the next pair above or below.
- adj. (Rhet.) Consisting of two rising and two falling clauses, placed in alternate opposition to each other.
WordNet 3.0
Etymologies
- From Latin decusso ("arrange crosswise or mark with a cross"), from decussis ("a 10 asses coin"), from decem ("ten") + as ("a Roman coin"). Based on the cross marking on the decussis coin. (Wiktionary)
- Latin decussāre, decussāt-, from decussis, the number ten, intersection of two lines (from the Romans' use of X for the numeral 10), a ten-as coin : decem, ten; see dekm̥ in Indo-European roots + assis, as (coin). (American Heritage® Dictionary of the English Language, Fourth Edition)
Examples
“The leaves on this plant are arranged in pairs opposite one another, with successive pairs at right angles to each other ( "decussate") along the red stem.”
“There are certain other nervous cords which decussate, are attached (to the vertebrae?), and are extended from both sides of them.”
“The optic nerves give off no branches in passing from their origin in two ganglia situated between the cerebrum and the cerebellum, and their termination in the eyeballs; but, in the middle of their course, they _decussate_, or unite in one mass.”
Hygienic Physiology : with Special Reference to the Use of Alcoholic Drinks and Narcotics
“It is curious to observe in these flowers how precisely one sepal occupies the position of the labellum, and how the lateral petals are displaced from the position they usually occupy, so as to form a regular flower, the segments of which decussate, thus giving rise to a species of regular peloria.”
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
“Now, referring to the ordinary notation of alternate leaves, we shall have the first leaf covered by the fifth, with two turns of the spiral; since decussate leaves result from two conjugate lines, the formula will be necessarily 2/5.”
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
“Thus, leaves normally opposite and decussate may, by fusion, become alternate.”
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
“The leaves of this plant are naturally rectiserial and decussate, but, in the twisted stem the leaves were curviserial, and arranged according to the 5/13 plan.”
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
“The simplest illustration of this arrangement is seen in the case of decussate leaves, where those organs are placed in pairs, and the pairs cross one another at right angles.”
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
“Cancellate: cross-barred: latticed: with longitudinal lines decussate by transverse lines.”
“After crossing the raphé, where they decussate with those from the opposite side, they turn upward to form the lateral lemniscus.”
IX. Neurology. 4e. Composition and Central Connections of the Spinal Nerves
Lists
These user-created lists contain the word ‘decussate’.
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phrontistery - d
from phrontistery.info
dysteleology, dyslogistic, dystectic, dysphoria, dysphonia, dystopia, dysphemism, dystocia, dyslogia, dysaesthesia, dyschromatopic, dysbulia and 624 more...
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Logolepsy
"Luciferous Logolepsy is a collection of over 9,000 obscure English words. Though the definition of an 'English' word might seem to be straightforward, it is not. There exist so many adopted, deriv...
Anschauung, Areopagus, Argus, Briarean, Dei gratia, Dei judicium, Deo volente, Duecento, Foehn, Geflugelte Worte, Gegenschein, Hakenkreuz and 9230 more...
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Kathy C's List
My favorite words
golconda, au fait, purlicue, tautonym, cunctatory, gynecomastia, vesta, imprimatur, efflux, antediluvian, protean, phlegmatic and 24 more...
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Something I -ate
Words in which the "-ate" suffix is used to mean "having," "resembling," "-like."
roseate, acaudate, lyrate, pinnate, acerate, falcate, pedunculate, petiolate, oblate, tessellate, spatulate, fimbriate and 158 more...
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via Weird and Wonderful Words
Catch-all for things culled from Weird and Wonderful Words, More Weird and Wonderful Words, and Totally Weird and Wonderful Words, by Erin McKean, et al.
aboulia, alexiteric, angletouch, dactylion, alveary, sparlire, glabella, philtrum, pallium, heart-spoon, hyperprosexia, paraprosexia and 438 more...
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summer words 2009
how many words can I make mine this summer?
largess, hoyden, catholic, fornicatress, quean, slattern, bildungsroman, sybaritic, descresent, nodus, frittle, callipygian and 529 more...
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patterns
ergodic, stochastic, stereopsis, echolocation, holocation, broker, map, intarsia, encipher, ocellus, muslin, mandelbrot set and 159 more...
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Uncle John’s Interesting Words
Words I find interesting.
abecedarius, acomoclitic, aperçu, apophenia, aspic, bêtise, bhang, callipygian, calque, carking, cataphract, ceruminous and 97 more...
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Favorite Verbs and Verb Forms
Culling my main Favorites list, and noticing how few of my favorite words are verbs. I'll have to work on that...
stupefy, eschew, gurgle, affianced, imbue, disconcerting, schlep, begrimed, wizened, woolgathering, lounge, flank and 94 more...
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Fall Words 2009
sgraffito, maestá, tempera, size, gesso, obsolescence, hinterland, taboret, pram, amygdalate, pandect, loggia and 105 more...
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littlemasumi's list
thaumatolatry, liminality, sophistry, myopia, prosopopeia, palimpsest, imbroglio, ephemeral, sentient, prescient, vicissitude, zeitgeist and 103 more...
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today's word
copemate, quiddity, ere, maugre, argal, cultivar, exurb, spokesmodel, rollick, logy, cadastral, corpulent and 259 more...
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Good words
Use them
erudite, acquiesce, allocutive, gylanic, naff, decussate, chasm, esoteric, enlightenment, illuminate, audacity, faux and 4 more...
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Prometheus
Words only for him.
όμο�?φος, concentric, kissable, ensorceler, beamish, pulchritudinous, inspiration, compulsion, flirt, sexpert, ambrosial, grapholagnia and 10 more...
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etymophily
Interesting gobbets of etymology
boudoir, down, sudoku, marijuana, venal, wedlock, decussate, dive, gloaming, coach, baptize, maroon and 13 more...
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introduction to death
words that cause death,or defines death.
detonate, explosive, ammunition, rocket, shrapnel, grenade, nitroglycerin, propellant, fireworks, fuel, combustible, electricity and 62 more...
Tweets
Looking for tweets for decussate.

reesetee Not as messy, anyway, c_b. May 27, 2009
qroqqa An odd formation. I wonder where the [u] came from in decem-ass-. Assuming it was formed after [m] was replaced by vowel nasalization (decem ['deke~:]), I would have thought you'd expect decess-. I see from Perseus that all the compounds from seven have the 'wrong' vowel, so it might be levelling by analogy with neighbouring numbers. May 27, 2009
chained_bear ... I guess it was better to carry around a copper coin than ten actual asses. May 27, 2009
oroboros The word originated from Latin "as" (plural asses) which was a copper coin and the monetary unit in ancient Rome. The word for ten asses was decussis, from Latin decem (ten) + as (coin). Since ten is represented by X, this spawned the verb decussare, meaning to divide in the form of an X or intersect. May 27, 2009