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chiasma

[ kahy-az-muh ]
/ ka瑟藞忙z m蓹 /
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noun, plural chi路as路mas, chi路as路ma路ta [kahy-az-muh-tuh]. /ka瑟藞忙z m蓹 t蓹/.
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.
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Also chi路asm [kahy-az-uhm]. /藞ka瑟 忙z 蓹m/.

Origin of chiasma

1830鈥40; <Greek: crosspiece of wood, cross-bandage, equivalent to chichi1 + -asma noun suffix

OTHER WORDS FROM chiasma

chi路as路mal, chi路as路mic, chi路as路mat路ic [kahy-az-mat-ik], /藢ka瑟 忙z藞m忙t 瑟k/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, 漏 Random House, Inc. 2022

How to use chiasma in a sentence

British Dictionary definitions for chiasma

chiasma

chiasm (藞ka瑟忙z蓹m)

/ (ka瑟藞忙zm蓹) /

noun plural -mas, -mata (-m蓹t蓹) or -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

Derived forms of chiasma

chiasmal or chiasmic, adjective

Word Origin for chiasma

C19: from Greek khiasma wooden crosspiece, from khiazein to mark with an X, from khi chi 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition 漏 William Collins Sons & Co. Ltd. 1979, 1986 漏 HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for chiasma

chiasma
[ k墨-膬zm蓹 ]

n. pl. chi鈥s鈥as
A crossing or intersection of two tracts, as of nerves or ligaments.
The point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and representing the cytological manifestation of crossing over.

Other words from chiasma

chi鈥smal null null adj.
The American Heritage庐 Stedman's Medical Dictionary Copyright 漏 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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