preservative medium

19 LETTERS · STARTS WITH P

preservative medium is a valid 19-letter word worth 31 points in Scrabble and 37 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3R1E1S1E1R1V4A1T1I1V4E1M3E1D2I1U1M3

3 + 1 + 1 + 1 + 1 + 1 + 4 + 1 + 1 + 1 + 4 + 1 + 0 + 3 + 1 + 2 + 1 + 1 + 3 =31 PTS

DOUBLE WORD → 62TRIPLE WORD → 93

MEANING

What does preservative medium mean?