immunosuppressant

NOUN
17 LETTERS · STARTS WITH I

immunosuppressant is a valid 17-letter word worth 25 points in Scrabble and 33 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
I1M3M3U1N1O1S1U1P3P3R1E1S1S1A1N1T1
1 + 3 + 3 + 1 + 1 + 1 + 1 + 1 + 3 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =25 PTS
DOUBLE WORD → 50TRIPLE WORD → 75
MEANING

What does immunosuppressant mean?