brat

1. brother (son of the same parents as another person)
2. brother (male having at least one parent in common with another)
3. brother (member of a men's religious order)
4. brother (member of a fraternity, tribe, or brotherhood)
5. brother (male companion or friend, usually with the same interests, experience, views, etc.)
6. brother (fellow human being)
7. brother endearing term of address for a male
8. brother; Further details are uncertain.