noun
1. : a disk having a spiral on its flat face for engaging with a worm wheel
2. : a wheel presenting a solid convex or concave surface from hub to rim
noun
1. : a disk having a spiral on its flat face for engaging with a worm wheel
2. : a wheel presenting a solid convex or concave surface from hub to rim
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012