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Hob

From Biology-Online Dictionary | Biology-Online Dictionary
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Hob

1. The hub of a wheel. See Hub.

2. The flat projection or iron shelf at the side of a fire grate, where things are put to be kept warm.

3. (Science: mechanics) a threaded and fluted hardened steel cutter, resembling a tap, used in a lathe for forming the teeth of screw chasers, worm wheels, etc.

Origin: Prob. Akin to hump. Cf. Hub.