Source : Webster's Revised Unabridged Dictionary (1913)

Levirostres \Lev`i*ros"tres\ (-r[o^]s"tr[=e]z), n. pl. [NL., fr.
   L. levis light + rostrum beak.] (Zo["o]l.)
   A group of birds, including the hornbills, kingfishers, and
   related forms.