Source : Webster's Revised Unabridged Dictionary (1913)

Pelecaniformes \Pel`e*can`i*for"mes\, n. pl. [NL. See {Pelican},
   and {-form}.] (Zo["o]l.)
   Those birds that are related to the pelican; the Totipalmi.

Source : WordNet®

Pelecaniformes
     n : pelicans; frigate birds; gannets; cormorants [syn: {order
         Pelecaniformes}]