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.
Also, chiasm
[kahy-az-uh m] /ˈkaɪ æz əm/ (Show IPA)
.
Origin
1830–40; < Greek: crosspiece of wood, cross-bandage, equivalent to chi chi1 + -asma noun suffix
Related forms
chiasmal, chiasmic, chiasmatic
[kahy-az-mat-ik] /ˌkaɪ æzˈmæt ɪk/ (Show IPA),
adjective
British Dictionary definitions for chiasmatic
chiasma or chiasm (kaɪˈæzmə, ˈkaɪæzəm)
 
n , pl -mas, -mata, -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
 
[C19: from Greek khiasma wooden crosspiece, from khiazein to mark with an X, from khichi1]
 
chiasm or chiasm (kaɪˈæzmə, ˈkaɪæzəm, -mətə)
 
n
 
[C19: from Greek khiasma wooden crosspiece, from khiazein to mark with an X, from khichi1]
 
chi'asmal or chiasm
 
adj
 
chi'asmic or chiasm
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
chiasmatic in Medicine

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

  1. A crossing or intersection of two tracts, as of nerves or ligaments.

  2. The point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and representing the cytological manifestation of crossing over.


chi·as'mal or chi·as'mic or chi'as·mat'ic (-māt'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source

Rhymes with chiasmatic

Tile value for chiasmatic

19
0
Scrabble Words With Friends