GNU Collaborative International Dictionary of English

Found one definition

      
{ Chiasm , ‖Chiasma , } n. [NL. chiasma, fr. Gr. χίασμα two lines placed crosswise, fr.  to mark with a χ.] (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

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