The Collaborative International Dictionary of English v.0.48:

Cecidomyia \Cec`i*do*my"i*a\
   (s[e^]s`[i^]*d[-o]*m[imac]"[i^]*[.a]), prop. n. [Nl., fr. Gr.
   khki`s, khki^dos, a gall nut + myi^a a fly.] (Zool.)
   A genus of small dipterous files, including several very
   injurious species, as the Hessian fly. See Hessian fly.
   [1913 Webster]