the.com/corncob

means The hard central core of an ear of corn that the kernels grow on, left behind once you've eaten or stripped off the corn.

from Simple and literal — a compound of 'corn' (Old English 'corn,' meaning grain in general before it narrowed to maize in American usage) plus 'cob,' an old word for a rounded lump, head, or tuft, used since medieval times for anything roundish and knobby, from a horse's head to a spider ('cobweb'). Put them together and you get exactly what it sounds like: the roundish core at the center of the corn.