antianxiety agent

NOUN
17 LETTERS · STARTS WITH A

antianxiety agent is a valid 17-letter word worth 27 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1N1T1I1A1N1X8I1E1T1Y4A1G2E1N1T1
1 + 1 + 1 + 1 + 1 + 1 + 8 + 1 + 1 + 1 + 4 + 0 + 1 + 2 + 1 + 1 + 1 =27 PTS
DOUBLE WORD → 54TRIPLE WORD → 81
MEANING

What does antianxiety agent mean?