tranquillize

VERB /træŋkwə,laɪz/
12 LETTERS · 3 SYLLABLES · STARTS WITH T

tranquillize is a valid 12-letter word worth 30 points in Scrabble and 34 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
T1R1A1N1Q10U1I1L1L1I1Z10E1
1 + 1 + 1 + 1 + 10 + 1 + 1 + 1 + 1 + 1 + 10 + 1 =30 PTS
DOUBLE WORD → 60TRIPLE WORD → 90
MEANING

What does tranquillize mean?