fibrillation Hear it!

fibrillation definition

fi·bril·la·tion (fib′ri lā′s̸hən, fī′bri-)

noun

a rapid, uncoordinated series of contractions of a muscle; esp., such contractions of some portion of the heart muscle, causing irregular heartbeats and sometimes ineffectual pumping of blood

Etymology: < fibril + -ation

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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