chiasm

Noun

chi=asm

WORDNET DICTIONARY

chiasm(n = noun.body) chiasma, decussation - an intersection or crossing of two tracts in the form of the letter X;

is a kind of anatomical structure, bodily structure, body structure, complex body part, structure

has particulars: chiasma opticum, optic chiasm, optic chiasma

Derived forms adjective chiasmal₁, adjective chiasmatic₁, adjective chiasmic₁

chiasm, n. [NL. chiasma, fr. Gr. chi`asma two lines placed crosswise, fr. to mark with a

A commissure; an intersection or crossing of two tracts; especially, the optic commissure, or crucial union of the optic nerves. [1913 Webster]