The adult male of the common domestic fowl.
Male chicken more than one year old
A male chicken usually kept for breeding.
A male chicken (sometimes applied to other species) over 1 year of age.
A male chicken more than a year old.
Full grown adult male game bird. Pheasants, turkeys, etc.
A rooster or cock is a male chicken, the female being a hen. A young cock is also called a cockerel. The term "rooster" is reputedly so used because the cock is said to roost over clutches of eggs to guard them.