An instrument, such as a drum, xylophone, piano, or maraca, in which sound is produced by one object striking another or by being scraped or shaken. (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.