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adjective
BotanyOf or relating to the family Onagraceae, of which Onagra (now Oenothera) was the type genus, and which includes plants such as the evening primroses, willowherbs, and fuchsias.
Origin
Mid 19th century; earliest use found in William T. Brande (1788–1866), chemist. From scientific Latin Onagraceae, family name + -ous.
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