- fibrillation - muscular twitching involving individual muscle fibers acting without coordination
--1 is a kind of twitch, twitching, vellication
--1 has particulars: atrial fibrillation; ventricular fibrillationDerived form: verb fibrillate1 - fibrillation - act or process of forming fibrils
--2 is a kind of branching, ramification, fork, forking