riser main

NOUN
10 LETTERS · STARTS WITH R

riser main is a valid 10-letter word worth 11 points in Scrabble and 13 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
R1I1S1E1R1M3A1I1N1
1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 =11 PTS
DOUBLE WORD → 22TRIPLE WORD → 33
MEANING

What does riser main mean?

NOUN · 1 SENSE
1

A vertical pipe in a building.