noun
the practice of marrying one's sibling
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Adelphogamy is the practice of marrying within one's own family or clan.
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I heard adelphogamy was common among certain royal families in history.
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People used to joke that adelphogamy was just a fancy way of saying marrying your cousin.
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In a figurative sense, adelphogamy can refer to any close-knit community where relationships are limited to within the group.