dipteran

from WordNet (r) 3.0 (2006)

dipteran
    n 1: insects having usually a single pair of functional wings
         (anterior pair) with the posterior pair reduced to small
         knobbed structures and mouth parts adapted for sucking or
         lapping or piercing [syn: {dipterous insect}, {two-winged
         insects}, {dipteran}, {dipteron}]

from The Collaborative International Dictionary of English v.0.48

Dipteran \Dip"ter*an\, n. (Zool.)
   An insect of the order Diptera.
   [1913 Webster]