A beat occurring as a contraction of a portion of a heart chamber cephalad to the chamber of origin.
Bracketology Won’t Help You Beat This Word Of The Day QuizSurfing cyberspace at a plumbeous pace? Then take this week's Word of the Day Quiz!
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.