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| fib·ril·la·tion [ fìbbrə láysh'n ] (plural fib·ril·la·tions) |
noun |
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1. rapid irregular heartbeat: rapid chaotic beating of the heart muscles in which the affected part of the heart may stop pumping blood
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2. rapid contraction of muscle fibers: rapid uncontrolled contraction of individual muscle fibers with little or no movement of the muscle as a whole
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3. formation of fibers: the formation of fibers or fibrils
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