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
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Merriam-Webster unabridged
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Time Traveler for chiasma
The first known use of chiasma was in 1839
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