broth·er 
/ˈbrʌðɚ/ noun
plural broth·ers /ˈbrʌðɚ/ noun [count] 1 : a boy or man who has one or both of the same parents as you
▪ my little/younger brother ▪ her big/older brother ▪ Her brother was adopted. — compare brother-in-law, half brother, stepbrother 2 : a man who is from the same group or country as you
▪ his college fraternity brothers ▪ We must support our brothers and sisters fighting overseas. 3 plural broth·ers or breth·ren : a male member of a religious group
▪ the brothers in a monastery — used especially as a title ▪ Brother John 4 US, informal : a black man — used especially by African-Americans 5 US, informal — used when talking to a man ▪ Brother, do you have an extra cigarette? ▪ Brother, you have got to relax. 6 chiefly US, informal — used as an interjection to express surprise or annoyance ▪ Brother was I ever sick. [=I was very sick] ▪ Oh, brother!
▪ my little/younger brother ▪ her big/older brother ▪ Her brother was adopted. — compare brother-in-law, half brother, stepbrother
▪ his college fraternity brothers ▪ We must support our brothers and sisters fighting overseas.
▪ the brothers in a monastery — used especially as a title ▪ Brother John
