Definition of "mustachio" [mus•ta•chio]

• A mustache, especially a luxuriant one. (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.

• "Does the plural form of mustachio refer to each group of whiskers on each side of the upper lip?"
• "He was a distinguished-looking man with a long, waxed mustachio."
• "Maybe his thin mustachio grows in a little too ginger for your taste."