extension spring

16 LETTERS · STARTS WITH E

extension spring is a valid 16-letter word worth 25 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

E1X8T1E1N1S1I1O1N1S1P3R1I1N1G2

1 + 8 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 3 + 1 + 1 + 1 + 2 =25 PTS

DOUBLE WORD → 50TRIPLE WORD → 75

MEANING

What does extension spring mean?