HOB

noun

1. A kind of cutting tool, used to cut the teeth of a gear.
2. The flat projection or iron shelf at the side of a fire grate, where things are put to be kept warm.
3. The top cooking surface on a cooker; a cooktop. It typically comprises several cooking elements (often four), also known as 'rings'.

verb

1. To create (a gear) by cutting with a hob.
2. To engage in the process of cutting gears with a hob.