microcapsule 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 tiny capsule designed to hold a minute amount of a medicine, chemical, etc. that is released when the capsule is melted, dissolved, or broken
microcapsule definition by American Heritage Dictionary
A small, sometimes microscopic capsule designed to release its contents when broken by pressure, dissolved, or melted.