double-helical gear

19 LETTERS · STARTS WITH D

double-helical gear is a valid 19-letter word worth 26 points in Scrabble and 32 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

D2O1U1B3L1E1-0H4E1L1I1C3A1L1G2E1A1R1

2 + 1 + 1 + 3 + 1 + 1 + 0 + 4 + 1 + 1 + 1 + 3 + 1 + 1 + 0 + 2 + 1 + 1 + 1 =26 PTS

DOUBLE WORD → 52TRIPLE WORD → 78

MEANING

What does double-helical gear mean?