(n)rock, stonematerial consisting of the aggregate of minerals like those making up the Earth's crust“that mountain is solid rock”, “stone is abundant in New England and there are many quarries”
(n)rock(figurative) someone who is strong and stable and dependable“he was her rock during the crisis”, “Thou art Peter, and upon this rock I will build my church” (The Bible, Matthew 16:18)
(n)rock 'n' roll, rock'n'roll, rock-and-roll, rock and roll, rock, rock musica genre of popular music originating in the 1950s; a blend of black rhythm-and-blues with white country-and-western“rock is a generic term for the range of styles that evolved out of rock'n'roll.”