adelphic

adjective
adel·​phic | \ ə-ˈdel-fik\

Definition of adelphic

: of or relating to a polygynous marriage in which the wives are sisters or to a polyandrous marriage in which the husbands are brothers

First Known Use of adelphic

1896, in the meaning defined above

History and Etymology for adelphic

Greek adelphikos brotherly, sisterly, from adelphos brother + -ikos -ic

Keep scrolling for more