Lusus-natur definitions

(historical, originally) A supposed capricious act of Nature regarded as the cause and origin of marked phænotypic anomalies in a given organism.
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(chiefly in this concrete sense) An organism exhibiting marked phænotypic deviation from the norm, seeming to be the result of sportive design.
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Origin of lusus-natur

From Latin lūsus nātūræ (“sport of Nature”), from lūsus (“playing”, “sport”) + nātūræ (“of Nature”), genitive singular form of nātūra (“Nature”).