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chi·as·ma

npl  -ma*ta   1  :  an anatomical intersection or decussation - see OPTIC CHIASMA   2  :  a cross-shaped configuration of paired chromatids visible in the diplotene of meiotic prophase and considered the cytological equivalent of genetic crossing-over chi*as*mat*ic adj 
 
   
 
Similar sounding terms:  chi·asm 

 
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