composition piston

18 LETTERS · STARTS WITH C

composition piston is a valid 18-letter word worth 25 points in Scrabble and 31 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3O1M3P3O1S1I1T1I1O1N1P3I1S1T1O1N1

3 + 1 + 3 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 1 =25 PTS

DOUBLE WORD → 50TRIPLE WORD → 75

MEANING

What does composition piston mean?