'Fibrillation' definitions:

Definition of 'fibrillation'

From: WordNet
noun
Muscular twitching involving individual muscle fibers acting without coordination
noun
Act or process of forming fibrils

Definition of 'Fibrillation'

From: GCIDE
  • Fibrillation \Fi`bril*la"tion\, n. The state of being reduced to fibers. --Carpenter. [1913 Webster]