The place where a munchkin used to be.
Center means middle. If you have a circle, the center is the middle.
Chocolate donut.
A polo? Donut?
A donut!!
inside a jelly donut
A good old ''donut''
ring
for decoration
A donut chart is the same as a pie chart, except the graphic has a hole in the middle.
There is no middle, except maybe hyperspace. After all, the hole of a doughnut is not part of the doughnut.
Cinder cone volcanoes look kind of like a mound/donut shaped. from the side view, it looks like there's a donut hole at the top in the middle. From the top view, it looks basically like a donut from the top view. =)
That would be a backfire. Over time time the middle of the problem cylinder will get eaten through the middle like a donut.