blood_brother
1. [ noun ] a male with the same parents as someone else
Synonyms: brother
Examples:

"my brother still lives with our parents"

Related terms: sister male_sibling stepbrother little_brother big_brother
2. [ noun ] a male sworn (usually by a ceremony involving the mingling of blood) to treat another as his brother
Related terms: ally
Similar spelling:   blood_berry
  blood_blister
  blood_type
  blood_flower
  blood_profile
  blood_bank
  blood_platelet