crust

1. A more solid, dense or hard layer on a surface or boundary. (countable, uncountable)
2. The external, hardened layer of certain foodstuffs, including most types of bread, fried meat, etc. (countable, uncountable)
3. An outer layer composed of pastry (countable, uncountable)
4. The bread-like base of a pizza. (countable, uncountable)
5. The outermost layer of the lithosphere of the Earth. (countable, uncountable) · Holonyms: lithosphere < Earth
6. The outermost layer of the lithosphere of any terrestrial planet. (countable, uncountable) · Holonyms: lithosphere < planet
7. The shell of crabs, lobsters, etc. (countable, uncountable)
8. Nerve, gall. (informal, uncountable) · You've got a lot of crust standing there saying that.

Plural crusts