1. The solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underlying the soil.
2. A large piece of rock which has become detached from a cliff or mountain; a boulder.
3. Move gently to and fro or from side to side.
Plural noun: Rocks.
Verb forms: Rock, Rocked, Rocked.
The beds of rock are slightly tilted.