You searched for: “adelphogamy
adelphogamy (s) (noun) (no pl)
1. A form of polyandry in which two or more brothers have or share the same wife, or wives: In the newspaper article, Nancy read about a mother who seemingly was wedded to two men who were brothers, termed adelphogamy, and had children with them as well.
2. The marriage of a brother and sister to each other: In the magazine there was an article about the son and daughter of one set of parents that lived in adelphogamy, which soon came to public attention.
3. In zoology, mating of brothers and sisters: Adelphogamy seemingly happens with certain kinds of ants.
4. In botany, fertilization between two different individuals derived vegetatively from the same parent plant: Adelphogamy takes place in some species of fungi and flowering plants.