koto definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a Japanese musical instrument of the zither family, with a rectangular body and seven to thirteen waxed silk strings
Origin: Japanese a generic term for zitherlike stringed instruments
koto definition by American Heritage Dictionary
noun pl. ko·tos
A Japanese musical instrument similar to a zither, having usually 13, but sometimes as few as 1 or as many as 17, silk strings stretched over an oblong box.