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From The Collaborative International Dictionary of English v.0.48:
Ovipositor \O`vi*pos"i*tor\, n. [L. ovum an egg + positor a placer, fr. ponere to place.] (Zool.) The organ with which many insects and some other animals deposit their eggs. Some ichneumon files have a long ovipositor fitted to pierce the eggs or larvae of other insects, in order to lay their own eggs within the same. [1913 Webster]