One of the mysteries of the English language finally explained.
Anthropology. Marriage between brothers and sisters, especially between several brothers of one family and a woman, or several sisters, of another.
Zoology. Mating between male and female siblings (especially in ants and certain other invertebrates).
Late 19th century. From ancient Greek ἀδελϕός brother + -gamy, probably after French adelphogamie.
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