HOB

Hob (?), n. [[Prob. akin to hump. Cf. Hub. ]] 1. 1. The hub of a wheel. See Hub. Washington.
2. 2. The flat projection or iron shelf at the side of a fire grate, where things are put to be kept warm. Smart.
3. 3. (Mech.) A threaded and fluted hardened steel cutter, resembling a tap, used in a lathe for forming the teeth of screw chasers, worm wheels, etc.