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chiasma medical definition

or chi·asm

noun pl. chi·as·mas or chi·as·ma·ta or chi·as·ms
  1. A crossing or intersection of two tracts, as of nerves or ligaments.
  2. The point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and representing the cytological manifestation of crossing over.

Related Forms:

  • chiasmal, chi·asˈmic, chiˌas·matˈic adjective

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