Ulmus alata

from WordNet (r) 3.0 (2006)

Ulmus alata
    n 1: North American elm having twigs and young branches with
         prominent corky projections [syn: {winged elm}, {wing elm},
         {Ulmus alata}]

from The Collaborative International Dictionary of English v.0.48

Whahoo \Wha*hoo"\, n. (Bot.)
   An American tree, the winged elm. ({Ulmus alata}).
   [1913 Webster]

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