A male domestic chicken (Gallus gallus domesticus) or other gallinaceous bird.
"The loud crowing of the rooster woke everyone up before sunrise."
The tenth of the 12-year cycle of animals which appear in the Chinese zodiac related to the Chinese calendar.
"Many people born in the Year of the Rooster believe they possess a strong sense of justice and attention to detail."
The word rooster comes from the combination of "roost" and the suffix "-er." It originally referred to a male bird that perches on a roost.