noun, plural chal·cid·flies.

any of numerous small flies of the family Chalcididae, often having bright metallic coloration, the larvae of which are chiefly parasitic on various stages of other insects.

Origin of chalcidfly

1890–95; < Greek chalk(ós) copper, brass (with allusion to the coloration) + -id2 + fly2
Also called chal·cid [kal-sid] /ˈkæl sɪd/, chalcid fly, chalcid wasp. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019