chiasma

play
noun chi·as·ma \kī-ˈaz-mə, kē-\

Definition of chiasma

plural

chiasmata

play \kī-ˈaz-mə-tə, kē-\
  1. 1 :  an anatomical intersection or decussation — compare optic chiasma

  2. 2 :  a cross-shaped configuration of paired chromatids visible in the diplotene stage of meiotic prophase and considered the cytological equivalent of genetic crossing-over

chiasmatic

play \ˌkī-əz-ˈma-tik, ˌkē-\ adjective

Origin and Etymology of chiasma

New Latin, X-shaped configuration, from Greek, crosspiece, from chiazein to mark with a chi, from chi (x)


First Known Use: 1839


Medical Dictionary

chiasma

play
noun chi·as·ma \kī-ˈaz-mə, kē-\

Medical Definition of chiasma

plural

chiasmata

\-mət-ə\play
  1. 1:  an anatomical intersection or decussation—see optic chiasma

  2. 2:  a cross-shaped configuration of paired chromatids visible in the diplotene of meiotic prophase and considered the cytological equivalent of genetic crossing-over

chiasmatic

\ˌkī-əz-ˈmat-ik, ˌkē-\play adjective

Learn More about chiasma


Seen and Heard

What made you want to look up chiasma? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

clear to the understanding

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • istock-refers-to-this-as-a-tumble-of-strawberries-which-sounded-pretty-nice-to-us
  • Which is a synonym of garner?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!