ETYM Old Eng. brother, AS. brôthor; akin to OS. brothar, Dutch broeder, Old High Germ. pruodar, German bruder, Icel. brôthir, Swed. and Dan. broder, Goth. brôthar, Irish brathair.
1. A male person who is a fellow member (of a fraternity or religion of other group).
2. A male with the same parents as someone else; SYN. blood brother.
3. Term of address for those male persons engaged in the same movement; SYN. comrade.