helical gear

12 LETTERS · STARTS WITH H

helical gear is a valid 12-letter word worth 17 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

H4E1L1I1C3A1L1G2E1A1R1

4 + 1 + 1 + 1 + 3 + 1 + 1 + 0 + 2 + 1 + 1 + 1 =17 PTS

DOUBLE WORD → 34TRIPLE WORD → 51

MEANING

What does helical gear mean?