One of the mysteries of the English language finally explained.
In insects: the male copulatory or sperm-depositing organ; an insect phallus or (typically) part of it, especially the distal portion.
Mid 19th century; earliest use found in The Zoologist: a miscellany of natural history. From scientific Latin aedeagus from ancient Greek αἰδοῖα genitals, plural of αἰδοῖον, use as noun of neuter of αἰδοῖος having a claim to regard, reverence, or compassion + ἀγός leader from ἄγειν to lead.
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