buttress thread

15 LETTERS · STARTS WITH B

buttress thread is a valid 15-letter word worth 20 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

B3U1T1T1R1E1S1S1T1H4R1E1A1D2

3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 4 + 1 + 1 + 1 + 2 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does buttress thread mean?