Definition from Wiktionary, the free dictionary
- An unrelated male considered to share a brother-like relationship established by a ceremonial sharing of blood in some cultures.
- (by extension) An unrelated male considered to share such a strong relationship generally.
- A brother by blood: a brother-german or half-brother, as distinguished from step-brothers.
someone bound to another person in commitment and friendship by a ceremonial mingling of blood
full brother — see brother-german