| 1. | a person's brother by birth. |
| 2. | a male person bound to another by ties of great friendship. |
| 3. | something usually associated with or thought to exist inseparably from another thing, quality, circumstance, etc.: Humility is often the blood brother of patience. |
| 4. | a male established in a close relationship with another male through the performance of a specific ritual, as the commingling of blood. |
| blood brother n.
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blood (brother)
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blood brotherhood
one of several kinds of alliances or ties that bind persons together in a fashion analogous to, but distinct from, kinship ties. Other forms of fictive kinship include adoption and godparenthood.
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