Music, Music and Dancethe original form of rock-'n'-roll, basically dependent on a consistently loud and strong beat. Cf. soft rock.
1965–70
hard′ rock′er.
hard-rock(härd′rok′),USA pronunciationadj.
Mining, Rocks(loosely) of or pertaining to igneous or metamorphic rocks, as in mining (hard′-rock min′ing) and geology (hard′-rock geol′ogy.) Cf. soft-rock geology.