Of a bird, esp. a fowl: having a topknot or tuft of feathers on the head, or feathers protruding from under the throat. Also: covered with…

Of a bird, esp. a fowl: having a crest of feathers on the head. Cf. muff, n.1 3c. Now rare.

Having or adorned with a tuft or tufts. Of a bird: Having a tuft of feathers upon the head; crested: esp. in Ornithology as the epithet of a…

Ornithology. (See quot. 1807 and cf. umbrella, n. compounds 1c.)

(of a fowl or breed of fowl) bearing a rose comb.

of or relating to the genus Opisthocomus or the family Opisthocomidae.