Metamorphic rock

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    one of the major groups of rock that makes up the crust of the Earth; consists of pre-existing rock mass in which new minerals or textures are formed at higher temperatures and greater pressures than those present on the Earth's surface. countable, uncountable
  2. 2
    rock altered by pressure and heat wordnet