Definitions for ichneumon fly
Random House Webster's College Dictionary
any of numerous wasplike insects of the family Ichneumonidae, the larvae of which are parasites of the larvae and pupae of many insects, esp. moths and butterflies.
Origin of ichneumon fly:
hymenopterous insect that resembles a wasp and whose larvae are parasitic on caterpillars and other insect larvae
(inaccurately named) ichneumon wasp
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