The Collaborative International Dictionary of English v.0.48:

Trochilus \Troch"i*lus\, n.; pl. Trochili. [L. trochilus a
   kind of small bird. Gr. ?, fr. ? to run.]
   1. (Zool.)
      (a) A genus of humming birds. It Formerly included all the
          known species.
      (b) Any one of several species of wrens and kinglets.
          [Obs.]
      (c) The crocodile bird.
          [1913 Webster]

   2. (Arch.) An annular molding whose section is concave, like
      the edge of a pulley; -- called also scotia.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Trochili \Troch"i*li\, n. pl. [NL. See Trochilus.] (Zool.)
   A division of birds comprising the humming birds.
   [1913 Webster]