The Collaborative International Dictionary of English v.0.48:

Flamingo \Fla*min"go\, n.; pl. Flamingoes. [Sp. flamenco, cf.
   Pg. flamingo, Prov. flammant, F. flamant; prop. a p. pr.
   meaning flaming. So called in allusion to its color. See
   Flame.] (Zool.)
   Any bird of the genus Ph[oe]nicopterus. The flamingoes have
   webbed feet, very long legs, and a beak bent down as if
   broken. Their color is usually red or pink. The American
   flamingo is P. ruber; the European is P. antiquorum.
   [1913 Webster]

WordNet (r) 3.0 (2006):

flamingo
    n 1: large pink to scarlet web-footed wading bird with down-bent
         bill; inhabits brackish lakes