[医] 交叉

[ noun ]
an intersection or crossing of two tracts in the form of the letter X
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Chiasm \Chi"asm\ (k[imac]"[a^]z'm), ||Chiasma \Chi*as"ma\
(k[-i]*[a^]z"m[.a]), n. [NL. chiasma, fr. Gr. chi`asma two
lines placed crosswise, fr. ? to mark with a [chi].] (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..