Webster's English Dictionary

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arum

ar.um \'ar-*m, 'er-\ n [NL, genus name, fr. L, arum, fr. Gk aron] : any of 
   a genus (Arum of the family Araceae, the arum family) of Ol d World plants 
   with flowers in a fleshy spathe subtended by a leafy bract; broadly : a 
   plant of the arum family