Source : Webster's Revised Unabridged Dictionary (1913)

Synentognathi \Syn`en*tog"na*thi\, n. pl. [NL., fr. Gr. sy`n
   with + 'ento`s within + gna`qos jaw.] (Zo["o]l.)
   An order of fishes, resembling the Physoclisti, without
   spines in the dorsal, anal, and ventral fins. It includes the
   true flying fishes.

Source : WordNet®

Synentognathi
     n : order of fishes having spineless fins; needlefishes;
         sauries; flying fishes; halfbeaks [syn: {order
         Synentognathi}]