/hɒb; hɑb/
n
(a) flat heating surface for a pan, kettle, etc on the top of a cooker 炉盘（炉具上部供放置锅、　等以加热的平面）.
(b) (esp formerly) flat metal shelf at the side of a fireplace, where a pan, kettle, etc can be heated （尤指旧时）（壁炉侧面供锅、　等加温用的）平面金属架.

n[C]BrE
[Date: 1600-1700; Origin: Origin unknown.]
the flat top of a cooker