One of the mysteries of the English language finally explained.
Of 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.
Mid 19th century; earliest use found in William T. Brande (1788–1866), chemist. From scientific Latin Onagraceae, family name + -ous.
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