Etymology
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rooster (n.)

"cock, male of the domestic hen," 1772, agent noun from roost (v.); earlier roost cock, c. 1600, in sense of "the roosting bird." Said to have become favored in the U.S. (it was noted by 1836 as a Yankeeism) and said to have been originally a puritan alternative to cock (n.) after that word had acquired the secondary sense "penis" (and compare roach).

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Definitions of rooster

rooster (n.)
adult male chicken;
Synonyms: cock
From wordnet.princeton.edu