chi·as·ma (k - z m ) also chi·asm (kz m)n. pl. chi·as·ma·ta (-m -t) or chi·as·mas also chi·asms 1. Anatomy A crossing or intersection of two tracts, as of nerves or ligaments. 2. Genetics The point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and representing the cytological manifestation of crossing over. [Greek kh asma, cross-piece, from khazein, to mark with an X, from khei, kh, chi (from the letter's shape).]chi·as mal, chi·asmic, chias·matic (-mt k) adj. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | chiasm - an intersection or crossing of two tracts in the form of the letter X anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical part of a living thing; "he has good bone structure" chiasma opticum, optic chiasm, optic chiasma - the crossing of the optic nerves from the two eyes at the base of the brain |
How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content.
| ?Page tools | ||
|---|---|---|
|