Definition of "triceps" [tri•ceps]

• A large three-headed muscle running along the back of the upper arm and serving to extend the forearm. (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.

• "CRUZ: That loose stuff on the back of your arm is called your triceps with maybe a little bit of fat on the top of it."
• "In this case the biceps must exert two units of strength more than the triceps, that is, seven units."
• "The triceps is the powerful muscle on the back of the upper arm that is responsible for straightening the elbow."