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noun flowers-of-an-hour n. An annual weedy herb (Hibiscus trionum) with ephemeral yellow purple-eyed flowers, native to the Old World tropics and naturalized as a weed in North America. Synonyms: flower-of-an-hour, bladder ketmia, black-eyed Susan, Hibiscus trionum.
Collaborative International Dictionary of English 0.48
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