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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Chi·asm Chi·as·ma n.  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..
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From: WordNet (r) 2.0

 chiasmal
      adj : of or relating to a chiasm [syn: chiasmic, chiasmatic]