Hypertext Webster Gateway: "chiasma"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Chiasm \Chi"asm\, Chiasma \Chi*as"ma\, n. [NL. chiasma, fr. Gr.
? two lines placed crosswise, fr. ? to mark with a [chi].]
(Anat.)
A commissure; especially, the optic commissure, or crucial
union of the optic nerves. -- {Chi*as"mal}, a..
From WordNet (r) 1.7 (wn)
chiasma
n : an intersection or crossing of two tracts in the form of the
letter X [syn: {chiasm}, {decussation}]
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