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The point at which homologous chromosomes or chromatids cross over and exchange genetic material during meiosis, a process in which the cell's nucleus divides.
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.
Chi"asm (?), Chi*as"ma (?), n. [NL. chiasma, fr. Gr. two lines placed crosswise, fr. to mark with a χ.] Anat.
A commissure; especially, the optic commissure, or crucial union of the optic nerves.
© Webster 1913.
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