Chal·cid fly  Zool. One of a numerous family of hymenopterous insects (Chalcididæ. Many are gallflies, others are parasitic on insects.
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  chalcid fly
       n : any of various tiny insects whose larvae are parasites on
           eggs and larvae of other insects; many are beneficial in
           destroying injurious insects [syn: chalcidfly, chalcid,
            chalcid wasp]