{ Chi″asm (kī″ăz'm), ‖Chi‐as″ma (kī̍‐ăz″mȧ), } n. [NL. chiasma, fr. Gr. χίασμα two lines placed crosswise, fr. � to mark with a χ.] (Anat.) A commissure; especially, the optic commissure, or crucial union of the optic nerves. — Chi‐as″mal (�), a..
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.