Etymology
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chiasma (n.)

in anatomy, "a crossing, an intersection," 1832, medical Latin, from Greek khiasma "two things placed crosswise," which is related to khiasmos (see chi, and compare chiasmus). In cytology from 1911. Related: Chiasmal.

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Definitions of chiasma

chiasma (n.)
an intersection or crossing of two tracts in the form of the letter X;
Synonyms: chiasm / decussation
From wordnet.princeton.edu