chiasma

[ kahy-az-muh ]

/ kaɪˈæz mə /

noun, plural chi·as·mas, chi·as·ma·ta [kahy-az-muh-tuh]. /kaɪˈæz mə tə/.

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.

Also chi·asm

[kahy-az-uhm]. /ˈkaɪ æz əm/.

Origin of chiasma

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

OTHER WORDS FROM chiasma

chi·as·mal, chi·as·mic, chi·as·mat·ic

[kahy-az-mat-ik], /ˌkaɪ æzˈmæt ɪk/, adjective

Words nearby chiasma

Chiantishire, Chian turpentine, Chiapas, Chiari's syndrome, chiaroscuro, chiasma, chiasmatypy, chiasmus, chiastic, chiastolite, chiaus

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for chiasma

In the sharks, rays, chimæras, and Ganoids the two optic nerves are joined in a chiasma as in the higher vertebrates.
A Guide to the Study of Fishes, Volume 1 (of 2)|David Starr Jordan
The nerves are fibrous, and a commencement of the chiasma is certainly present.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
We know that they are directly connected by fibres that arch round through the chiasma.
Medical Essays|Oliver Wendell Holmes, Sr.
From the under side of these, nerves run to the eyes with or without a chiasma or crossing.
Elementary Zoology, Second Edition|Vernon L. Kellogg

At the base of the section are seen the optic nerves and their chiasma.
The Works of Francis Maitland Balfour, Volume IV (of 4)|Francis Maitland Balfour

British Dictionary definitions for chiasma

chiasma

chiasm (ˈkaɪæzəm)

/ (kaɪˈæzmə) /

noun plural -mas, -mata (-mətə) 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 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for chiasma

chiasma

[ kī-ăz′mə ]

n. pl. chi•as•mas

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•as′mal null null adj.

单词	chiasma
释义	chiasma [ kahy-az-muh ] / kaɪˈæz mə / noun, plural chi·as·mas, chi·as·ma·ta [kahy-az-muh-tuh]. /kaɪˈæz mə tə/. 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. Also chi·asm [kahy-az-uhm]. /ˈkaɪ æz əm/. Origin of chiasma 1830–40; <Greek: crosspiece of wood, cross-bandage, equivalent to chichi¹ + -asma noun suffix OTHER WORDS FROM chiasma chi·as·mal, chi·as·mic, chi·as·mat·ic [kahy-az-mat-ik], /ˌkaɪ æzˈmæt ɪk/, adjective Words nearby chiasma Chiantishire, Chian turpentine, Chiapas, Chiari's syndrome, chiaroscuro, chiasma, chiasmatypy, chiasmus, chiastic, chiastolite, chiaus Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for chiasma In the sharks, rays, chimæras, and Ganoids the two optic nerves are joined in a chiasma as in the higher vertebrates. A Guide to the Study of Fishes, Volume 1 (of 2)\|David Starr Jordan The nerves are fibrous, and a commencement of the chiasma is certainly present. The Works of Francis Maitland Balfour, Volume 1\|Francis Maitland Balfour We know that they are directly connected by fibres that arch round through the chiasma. Medical Essays\|Oliver Wendell Holmes, Sr. From the under side of these, nerves run to the eyes with or without a chiasma or crossing. Elementary Zoology, Second Edition\|Vernon L. Kellogg At the base of the section are seen the optic nerves and their chiasma. The Works of Francis Maitland Balfour, Volume IV (of 4)\|Francis Maitland Balfour British Dictionary definitions for chiasma chiasma chiasm (ˈkaɪæzəm) / (kaɪˈæzmə) / noun plural -mas, -mata (-mətə) 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 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for chiasma chiasma [ kī-ăz′mə ] n. pl. chi•as•mas 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•as′mal null null adj. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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