pipe thread

11 LETTERS · STARTS WITH P

pipe thread is a valid 11-letter word worth 18 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3I1P3E1T1H4R1E1A1D2

3 + 1 + 3 + 1 + 0 + 1 + 4 + 1 + 1 + 1 + 2 =18 PTS

DOUBLE WORD → 36TRIPLE WORD → 54

MEANING

What does pipe thread mean?