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chiasma
noun, pl -mata [X-shaped configuration,
fr. Gk crosspiece, fr. chiazein to
mark with a chi, fr. chi (letter X)]
1: an anatomical intersection or decussation
? compare 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.
chiasmus,
noun (fr. Gk chiasmos, fr. chiazein
to mark with a chi (X)): an inverted
relationship between the syntactic
elements of parallel phrases (as in
Goldsmith's to stop too fearful,
and too faint to go).
optic
chiasma: the X-shaped partial
decussation on the undersurface of
the hypothalamus through which the
optic nerves are continuous with the
brain.
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