Meaning of herringbone gear

her'ringbone gear"

Pronunciation: [key]
  1. a helical gear having teeth that lie on the pitch cylinder in a-shaped form so that one half of each tooth is on a right-handed helix and the other half on a left-handed helix. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.