chiasma definition
Definition of chiasma. plural. chiasmata. play \kÄ«-Ëaz-mÉ-tÉ, kÄ-\. 1 : an anatomical intersection or decussation â compare optic chiasma. 2 : a cross-shaped configuration of paired chromatids visible in the diplotene stage of meiotic prophase and considered the cytological equivalent of genetic crossing-over.
chiasma chiÂ·asÂ·ma (kÄ«-Äz'mÉ) or chiÂ·asm (kÄ«'Äz'Ém) n. pl. or chiÂ·asÂ·mas, chiÂ·asÂ·maÂ·ta (-mÉ-tÉ), chiÂ·asÂ·ms. A crossing or intersection of two tracts, as of nerves or ligaments.