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chiasma

play
noun chi·as·ma \kī-ˈaz-mə, kē-\

Definition of chiasma

plural chiasmataplay play \-mə-tə\

  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 of chiasma

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


First Known Use: 1839

Rhymes with chiasma


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



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