the GNU version of the Collaborative International Dictionary of English
n. One who shouts.
The Century Dictionary and Cyclopedia
n. One who shouts.
n. Hence A noisy or enthusiastic adherent of a person or cause.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. someone who communicates vocally in a very loud voice
Word Usage
"I had a friend, a "shouter" - whose trailer featured by way of cultural uplift only the Bible and a big TV set tuned to the Christian Broadcasting Network, on which Pat Robertson used to denounce New Age paganism on an hourly basis."