Chiasma



[kahy-az-muh] /kaɪˈæz mə/

noun, plural chiasmas, chiasmata
[kahy-az-muh-tuh] /kaɪˈæz mə tə/ (Show IPA)
1.
Anatomy. a crossing or decussation, as that of the optic nerves at the base of the brain.
2.
Cell Biology. a point of overlap of paired chromatids at which fusion and exchange of genetic material take place during prophase of meiosis.
/kaɪˈæzmə/
noun (pl) -mas, -mata (-mətə), -asms
1.
(cytology) the cross-shaped connection produced by the crossing over of pairing chromosomes during meiosis
2.
(anatomy) the crossing over of two parts or structures, such as the fibres of the optic nerves in the brain
n.

“a crossing,” 1832, medical Latin, from Greek khiasma “two things placed crosswise,” which is related to khiasmos (see chiasmus). In cytology from 1911.

chiasma chi·as·ma (kī-āz’mə) or chi·asm (kī’āz’əm)
n. pl. or chi·as·mas, chi·as·ma·ta (-mə-tə), chi·as·ms

chi·as’mal or chi·as’mic or chi’as·mat’ic (-māt’ĭk) adj.

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  • Chiasmatic

    [kahy-az-muh] /kaɪˈæz mə/ noun, plural chiasmas, chiasmata [kahy-az-muh-tuh] /kaɪˈæz mə tə/ (Show IPA) 1. Anatomy. a crossing or decussation, as that of the optic nerves at the base of the brain. 2. Cell Biology. a point of overlap of paired chromatids at which fusion and exchange of genetic material take place during prophase of meiosis. […]



  • Chiasmatypy

    [kahy-az-muh-tahy-pee] /kaɪˈæz məˌtaɪ pi/ noun, Genetics. 1. the process of formation, which is the basis for crossing over.

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