The Collaborative International Dictionary of English v.0.48:

Jacamar \Jac"a*mar`\, n. [F. jacamar, Braz. jacamarica; cf. Sp.
   jacamar.] (Zool.)
   Any one of numerous species of tropical American birds of the
   genus Galbula and allied genera. They are allied to the
   kingfishers, but climb on tree trunks like nuthatches, and
   feed upon insects. Their colors are often brilliant.
   [1913 Webster]

WordNet (r) 3.0 (2006):

jacamar
    n 1: tropical American insectivorous bird having a long sharp
         bill and iridescent green or bronze plumage