the male of domestic fowl and certain game birds; cock.
a representation of this bird, used as an emblem of the Democratic Party from 1842 to 1874.
Informal. a cocky person.

1765–75; roost + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rooster (ˈruːstə)
chiefly (US), (Canadian) the male of the domestic fowl; a cock

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1772, from roost (earlier roost cock, 1606), in sense of "the roosting bird," favored in the U.S. as a puritan alternative to cock (and compare roach).
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

rooster definition

  1. n.
    the posterior; one's butt end. (Because one roosts on it.) : Don't just sit there on your rooster. Get to work.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
When someone set the alarm in the internal clock, they would click on a picture
  of a rooster.
If a rooster crows every minute of every hour of every day, eventually it will
  crow when the sun rises.
Undercover officers pose as construction workers to gather evidence of rooster
Undercover agents arrest a suspected rooster fighter while in possession of
  contraband birds.
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