rock

1. The naturally occurring aggregate of solid mineral matter that constitutes a significant part of the earth's crust. (uncountable) · The face of the cliff is solid rock.
2. A mass of stone projecting out of the ground or water. (countable, uncountable) · The ship crashed on the rocks.
3. Any natural material with a distinctive composition of minerals. (countable, uncountable)
4. A precious stone or gem, especially a diamond. (colloquial, countable, uncountable) · Look at the size of that rock on her finger!
5. A large hill or island having no vegetation. (countable, uncountable) · The captain named it Pearl Rock after the rising sun illuminated the surface of the island.
6. Something that is strong, stable, and dependable; a person who provides security or support to another. (countable, figuratively, uncountable) · 1991, Robert Harling and Andrew Bergman, Soapdish, Paramount Pictures, Celeste Talbert: She is my rock, my right hand.
7. A lump or cube of ice. (countable, uncountable) · I'll have a whisky on the rocks, please.
8. A crystallized lump of crack cocaine. (US, countable, slang, uncountable)

Plural rocks