Search Result for "fibrillate": 
Wordnet 3.0

VERB (1)

1. make fine, irregular, rapid twitching movements;
- Example: "His heart fibrillated and he died"



WordNet (r) 3.0 (2006):

fibrillate
    v 1: make fine, irregular, rapid twitching movements; "His heart
         fibrillated and he died"