Ovipositor

n. tube-like organ for laying eggs (in many female insects); egg-laying organ in some fishes and other animals (Zoology)

The ovipositor is an organ used by some of the arthropods for oviposition, i.e. the laying of eggs. It consists of a maximum of three pairs of appendages formed to transmit the egg, to prepare a place for it, and to place it properly. In some of the insects the organ is used merely to attach the egg to some surface, but in many parasitic species (primarily in wasps and hymenoptera) it is a piercing organ as well. It is used by the grasshoppers to force a burrow in the earth to receive the eggs and by cicadas to pierce the wood of twigs for a similar purpose. Both long-horned grasshoppers and sawflies cut the tissues of plants by means of the ovipositor. None of these examples is quite as remarkable as the Megarhyssa species of Ichneumon wasp (parasitic Hymenoptera), the females of which have a slender ovipositor several inches long, used to drill into the wood of tree trunks. These species are parasitic in the larval stage on the larvae of wood-boring insects, hence the egg must be deposited in the burrow of the host (or, often, directly into the host's body as it is feeding.)
See more at Wikipedia.org...

Noun
1. egg-laying tubular structure at the end of the abdomen in many female insects and some fishes
(hypernym) organ

n. ovipositor, tube-like organ for laying eggs (in many female insects)

(n.)
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.