chiasma

chi·as·ma

noun \kī-ˈaz-mə, kē-\

plural chi·as·ma·ta\-mə-tə\

Definition of CHIASMA

1

: an anatomical intersection or decussation — compare optic chiasma

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

— chi·as·mat·ic \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

miasma, phantasma