Definition of arum
: any of a genus (Arum of the family Araceae, the arum family) of Eurasian plants having usually arrow-shaped leaves and a showy spathe partially enclosing a spadix
broadly
: a plant of the arum family
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Merriam-Webster unabridged
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Time Traveler for arum
The first known use of arum was in the 14th century
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