Etymology

eyebright

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Today it means: Any of the flowering plants of the genus Euphrasia, originally as used to treat eye infections. Full definition →

First used 16th c.
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The story

Compound of eye (noun) + bright (verb).

First known use, by meaning

  • from 16th c. Any of the flowering plants of the genus Euphrasia, originally as used to treat eye infections.

Etymology from Wiktionary, CC BY-SA 4.0.