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chiasma n. 交叉 交叉 chiasma n 1: an intersection or crossing of two tracts in the form of the letter X [synonym: {chiasma}, {chiasm}, {decussation}] Chiasm \Chi"asm\ (k[imac]"[a^]z'm), Chiasma \Chi*as"ma\
(k[-i]*[a^]z"m[.a]), n. [NL. chiasma, fr. Gr. chi`asma two lines placed crosswise, fr. ? to mark with a [chi].] (Anat.) A commissure; an intersection or crossing of two tracts; especially, the optic commissure, or crucial union of the optic nerves. -- {Chi*as"mal}, a.. [1913 Webster] chiasmatic chiasmal
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