Etymology

acanthaceous

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Today it means: Of, pertaining to, or resembling, a member of the Acanthaceae family. Full definition →

First used First attested in the mid 18th century.
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The story

From taxonomic name Acanthaceae + -ous.

First known use, by meaning

  • First attested in the mid 18th century. Of, pertaining to, or resembling, a member of the Acanthaceae family.

Etymology from Wiktionary, CC BY-SA 4.0.