Crumb (noun)

1. A small piece of bread or cake that has broken off from the whole.
2. A small piece of any food that has broken off or crumbled.

Origin:

Old english cruma "morsel, fragment", of germanic origin; related to dutch kruim and german krume.

Examples:

1. He brushed the crumbs off the table.
2. The crumb of the cake was delicious.
3. The bread was fresh and had a nice crumb.
4. She sprinkled crumbs on top of the casserole before baking.
5. The crumb of the cookie was sweet and buttery.