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The large four-part extensor muscle at the front of the thigh.
quad′ri·cip′i·tal (-sĭp′ĭ-tl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.