Source : Webster's Revised Unabridged Dictionary (1913)

Odonata \O*don"a*ta\, n. pl. [NL., fr. Gr. 'odoy`s, 'odo`ntos, a
   tooth.] (Zo["o]l.)
   The division of insects that includes the dragon flies.

Source : WordNet®

Odonata
     n : dragonflies and damselflies [syn: {order Odonata}]