The nuclear bomb dropped over Hiroshima, Japan on August 6, 1945.

A very young male human being, from birth to a couple of years old. / (derogatory) A man who is immature or infantile. / (slang) A term of endearment for a man.

Used other than figuratively or idiomatically: see bad, boy. / A man whose rebellious nature makes him dangerous and/or attractive. / (slang) A male criminal.

(chiefly Britain) Someone who has an anonymous support role in an organization, especially a technician or scientist; a boffin.

A girlish boy.

(idiomatic) A male exemplar of some trait.

A young man who has become unusually successful at an early age. / A favored youth, held in high esteem by others, and for whom there are high hopes.

(Britain) A boy chosen to lead a school sixth form, whose duties may include representing the school and organising the prefects.

(sports) A person, usually male, responsible for retrieving balls from the area of play, and returning them to the players.

(Tyneside) A man who works on market stalls (barras).