1. brother, blood brother, male sibling

usage: a male with the same parents as someone else; "my brother still lives with our parents"

2. brother, member, fellow member

usage: a male person who is a fellow member (of a fraternity or religion or other group); "none of his brothers would betray him"

3. buddy, brother, chum, crony, pal, sidekick, friend

usage: a close friend who accompanies his buddies in their activities

4. brother, comrade, friend

usage: used as a term of address for those male persons engaged in the same movement; "Greetings, comrade!"

5. Brother, monk, monastic

usage: (Roman Catholic Church) a title given to a monk and used as form of address; "a Benedictine Brother"

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