Definition of rosy periwinkle
: a commonly cultivated subshrub (Catharanthus roseus synonym Vinca rosea) of the dogbane family that is native to the Old World tropics and is the source of several antineoplastic drugs
— called also Madagascar periwinkle, periwinkle
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Merriam-Webster unabridged
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Time Traveler for rosy periwinkle
The first known use of rosy periwinkle was in 1982
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