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ichneumon wasp

noun
variants: or less commonly ichneumon fly
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Definition of ichneumon wasp

: any of a large family (Ichneumonidae) of brown or black hymenopterous insects that have a slender body and long ovipositor and whose larvae are parasites of the larvae and pupae of various insects

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First Known Use of ichneumon wasp

1671

in the meaning defined above

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