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Meaning of hard rock

hard' rock'

Pronunciation: [key]
  1. the original form of rock-'n'-roll, basically dependent on a consistently loud and strong beat. Cf. soft rock.

hard-rock

Pronunciation: (härd'rok"), [key]
— adj.
  1. (loosely) of or pertaining to igneous or metamorphic rocks, as in mining and geology Cf. soft-rock geology.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.