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Definition of Blood brother
1. Noun. A male with the same parents as someone else. "My brother still lives with our parents"
Exact synonyms: Brother
Specialized synonyms: Big Brother, Little Brother, Half Brother, Half-brother, Stepbrother
Generic synonyms: Male Sibling
Derivative terms: Brotherly
Antonyms: Sister
Specialized synonyms: Big Brother, Little Brother, Half Brother, Half-brother, Stepbrother
Generic synonyms: Male Sibling
Derivative terms: Brotherly
Antonyms: Sister
2. Noun. A male sworn (usually by a ceremony involving the mingling of blood) to treat another as his brother.
Definition of Blood brother
1. Noun. A brother by birth. ¹
2. Noun. Someone bound to another person in commitment and friendship by a ceremonial mingling of blood. ¹
¹ Source: wiktionary.com