Odonata

from WordNet (r) 3.0 (2006)

Odonata
    n 1: dragonflies and damselflies [syn: {Odonata}, {order
         Odonata}]

from The Collaborative International Dictionary of English v.0.48

Odonata \O*don"a*ta\, n. pl. [NL., fr. Gr. 'odoy`s, 'odo`ntos, a
   tooth.] (Zool.)
   The division of insects that includes the dragon flies.
   [1913 Webster]