Search Result for "arrhythmia": 
Wordnet 3.0

NOUN (1)

1. an abnormal rate of muscle contractions in the heart;
[syn: cardiac arrhythmia, arrhythmia]



WordNet (r) 3.0 (2006):

arrhythmia
    n 1: an abnormal rate of muscle contractions in the heart [syn:
         cardiac arrhythmia, arrhythmia]