FIBRILLATE Meaning of FIBRILLATE in English v. 1. intr. a (of a fibre) split up into fibrils. b (of a muscle, esp. in the heart) undergo a quivering movement in fibrils. 2 tr. break (a fibre) into fibrils. Derivatives: fibrillation n. Oxford English vocab. Оксфордский английский словарь. 2012