- 1. n. A commissure; especially, the optic commissure, or crucial union of the optic nerves. Source: opted
- 2. n. an intersection or crossing of two tracts in the form of the letter X Source: wordnet
- 3. A commissure; especially, the optic commissure, or crucial union of the optic nerves. -- Chi*as"mal (, a.. Source: webster
- 4. n. an intersection or crossing of two tracts in the form of the letter X Source: ecdict
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chiasma
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