Definition of pelargonium
: any of a genus (Pelargonium) of southern African herbs of the geranium family with showy flowers of usually red, pink, or white distinguished by a spurred calyx and irregular corolla
— called also geranium, storksbill
— compare rose geraniumTest Your Vocabulary
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Merriam-Webster unabridged
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Time Traveler for pelargonium
The first known use of pelargonium was in 1813
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