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THESAURUS

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WORDNET DICTIONARY

Noun blood brother has 2 senses

• blood brother(n = noun.person) brother - a male with the same parents as someone else; "my brother still lives with our parents"
has particulars: big brother, little brother, half-brother, half brother, stepbrother
is a kind of male sibling

• blood brother(n = noun.person) Array - a male sworn (usually by a ceremony involving the mingling of blood) to treat another as his brother; Array
is a kind of ally, friend

THESAURUS

blood brother

aunt, auntie, brethren, brother, bub, bubba, bud, buddy, country cousin, cousin, cousin once removed, cousin twice removed, daughter, father, first cousin, foster brother, frater, grandnephew, grandniece, granduncle, great-aunt, great-uncle, half brother, kid brother, mother, nephew, niece, nuncle, nunks, nunky, second cousin, sis, sissy, sister, sister-german, sistern, son, stepbrother, stepsister, unc, uncle, uncs, uterine brother

For further exploring for "blood brother" in Webster Dictionary Online