antimalarial

NOUN /,æntimə'lɜriəl/
12 LETTERS · 6 SYLLABLES · STARTS WITH A

antimalarial is a valid 12-letter word worth 14 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1N1T1I1M3A1L1A1R1I1A1L1
1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =14 PTS
DOUBLE WORD → 28TRIPLE WORD → 42
MEANING

What does antimalarial mean?