noun
: a gear wheel with teeth intersecting the pitch surface in helical lines and thus forming parts of the threads of a many-threaded screw : helical gear — called also screw gear
noun
: a gear wheel with teeth intersecting the pitch surface in helical lines and thus forming parts of the threads of a many-threaded screw : helical gear — called also screw gear
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012