self-threading

14 LETTERS · 2 SYLLABLES · STARTS WITH S

self-threading is a valid 14-letter word worth 21 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1E1L1F4-0T1H4R1E1A1D2I1N1G2

1 + 1 + 1 + 4 + 0 + 1 + 4 + 1 + 1 + 1 + 2 + 1 + 1 + 2 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does self-threading mean?