One that watches or observes: a fire watcher; a watcher of Sino-American relations. (noun)
One who keeps vigil, as at a sick person's bedside. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "watcher" in a sentence
"For every one of us who says actress or hostess or priestess, there is a word watcher, ready with Wite-Out and caret, who believes that, be they male or female, the correct words are actor, host, and priest."
"The market watcher is looking for tablet unit sales to total around 54.8 million next year and top 208 million in 2014."
"A watcher from the opposing team dragged her screaming away and was dropped like a steer by an ear-blow from a partisan from the woman's team."