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plural ovipositors
(zoology) A tubular protruding organ for laying eggs. quotations
I'm fascinated by a splendid European wasp - Rhyssa persuasoria (sabre wasp). […] It has a remarkable ovipositor. That's the multi-function "hypodermic needle" at the end of the abdomen, and, in this instance, it doubles the length of the wasp to about 8cm.
2019 September 15, Jonathan Amos, “Wasps: If you can't love them, at least admire them”, in BBC News