plenum system

13 LETTERS · STARTS WITH P

plenum system is a valid 13-letter word worth 21 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3L1E1N1U1M3S1Y4S1T1E1M3

3 + 1 + 1 + 1 + 1 + 3 + 0 + 1 + 4 + 1 + 1 + 1 + 3 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does plenum system mean?