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[kahy-az-muh] /kaɪˈæz mə/

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

“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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  • Chiastic

    [kahy-as-tik] /kaɪˈæs tɪk/ adjective, Rhetoric. 1. characterized by chiasmus. adj. 1856, from Latinized fdorm of Greek khiastos “arranged diagonally; marked with an X” (i.e., resembling the Greek letter chi) + -ic.

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    [kahy-as-tl-ahyt] /kaɪˈæs tlˌaɪt/ noun 1. a variety of the mineral andalusite having cruciform carbonaceous inclusions. /kaɪˈæstəˌlaɪt/ noun 1. a variety of andalusite containing carbon impurities Also called macle

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    [chous, choush] /tʃaʊs, tʃaʊʃ/ noun, plural chiauses. 1. (in the Ottoman Empire) a court official who served as an ambassador, emissary, or member of a ceremonial escort. 2. a Turkish military rank approximating that of sergeant.

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