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.
- 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.
- 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)
“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.”
“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.”
“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.”
“Thus, leaves normally opposite and decussate may, by fusion, become alternate.”
“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.”
“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.”
“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.”
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