adelphogamy
noun
ad·el·phog·a·my
ˌa-dᵊl-ˈfä-gə-mē
plural -es
1
: polyandry in which brothers have a wife or wives in common
2
zoology
: mating of brothers and sisters (as in some ants)
3
: union of mother and daughter cells (as in some yeasts)
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Merriam-Webster unabridged
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