Pronunciation: (bru&thslash;'ur or, for 9, bru&thslash;'ûr'), [key]
—n., pl. brothers, (Archaic) brethren;
1. a male offspring having both parents in common with another offspring; a male sibling.
2. Also called half brother. a male offspring having only one parent in common with another offspring.
3. a stepbrother.
4. a male numbered among the same kinship group, nationality, race, profession, etc., as another; an associate; a fellow member, fellow countryman, fellow man, etc.: a fraternity brother.
a. (often cap.) a male numbered among the lay members of a religious organization that has a priesthood.
b. a man who devotes himself to the duties of a religious order without taking holy orders, or while preparing for holy orders.
6. brothers,all members of a particular race, or of the human race in general: All men are brothers.
7. Slang.fellow; buddy: Brother, can you spare a dime?
8. Informal.a black man; soul brother.
Slang.(used to express disappointment, disgust, or surprise).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.