2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: 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 From WordNet (r) 2.0 [wn]: chiasma n : an intersection or crossing of two tracts in the form of the letter X [syn: {chiasm}, {decussation}] [also: {chiasmata} (pl)]
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