chiasma Meaning, Definition & Usage

  1. noun an intersection or crossing of two tracts in the form of the letter X
    chiasm; decussation.

WordNet

Chi"asm, Chi*as"ma noun (Also<
  • Chiasm
  • Chiasma
)
Etymology
NL. chiasma, fr. Gr. two lines placed crosswise, fr. to mark with a χ.
Definitions
  1. (Anat.) A commissure; especially, the optic commissure, or crucial union of the optic nerves. -- Chi*as"mal a..

Webster 1913