1
- a man or boy in relation to other sons and daughters of his parents兄弟。
1.1
- a male associate or fellow member of an organization（男）同人, （男）同事：
the time is coming, brothers, for us to act.
伙伴们！是我们起来行动的时候了。
1.2
- informal, chiefly N. Amer. a black man (chiefly used as a term to address by other black people)〈非正式, 主北美〉黑人兄弟（主要用于黑人之间的称呼）。
1.3
- a thing which resembles or is connected to another thing相似物; 相关物：
the machine is almost identical to its larger brother.
这台机器的样子与比它大的那台几乎一样。
2
- （pl.,亦作brethren）Christian Church a (male) fellow Christian【基督教】（男）基督会教友。
2.1
- a member of a religious order of men（某修道的）男教友：
a Benedictine brother.
一位本笃会的教友。
2.2
- a member of a fundamentalist Protestant denomination信奉基要主义的新教派的教徒：
the Plymouth Brethren.
普利茅斯兄弟会。
- used to express annoyance or surprise.老兄（用来表示恼怒或惊讶）。
短语
brothers in arms
- soldiers fighting together on the same side战友。
派生词
brotherliness
nounbrotherly
adjective词源
Old English brōthor, of Germanic origin; related to Dutch broeder and German Bruder, from an Indo-European root shared by Latin frater.