Cecidomyia \Cec`i*do*my"i*a\, n. [Nl., fr. Gr. khki`s, ?, a gall nut + myi^a a fly.]

(Zo["o]l.) A genus of small dipterous files, including several very injurious species, as the Hessian fly. See Hessian fly.

Source: Webster's Revised Unabridged Dictionary (1913)