From Longman Dictionary of Contemporary Englishroosterroost‧er /ˈruːstə $ -ər/ noun [countable] 
HBBa male chicken SYN cock British English
HBBa male chicken SYN cock British EnglishExamples from the Corpus
rooster• So the laundress was grateful; she had killed a rooster for him.• The editor had pushed his left sleeve up and Bernstein had seen a tattoo of a rooster.• Outside, a rooster crowed some way off, and right underneath her some one split kindling with a quick thunk thunk thunk.• The best Chianti has a black rooster on the label.• The average domestic rooster is considerably louder than other birds and is therefore the most noticeable at dawn.• A neighborhood rooster crows once and then twice and then falls silent.• Only sensation survived: being deafened by the rooster, yet finding silence unendurable. 