arrhythmia

NOUN /ə'rɪðmiə/
10 LETTERS · 4 SYLLABLES · STARTS WITH A

arrhythmia is a valid 10-letter word worth 21 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1R1R1H4Y4T1H4M3I1A1
1 + 1 + 1 + 4 + 4 + 1 + 4 + 3 + 1 + 1 =21 PTS
DOUBLE WORD → 42TRIPLE WORD → 63
MEANING

What does arrhythmia mean?