WordReference Random House Learner's Dictionary of American English © 2015
out•crop /n. ˈaʊtˌkrɑp; v. ˌaʊtˈkrɑp/USA pronunciation n., v., -cropped, -crop•ping.

n. [countable]
  • an area where something has risen to the surface of the earth, as a layer of bedrock.
  • the exposed portion of such a layer.

v. [no object]
  • Geologyto rise suddenly to the surface of the earth, as layers of bedrock.

  • Collins Concise English Dictionary © HarperCollins Publishers::

    outcrop n /ˈaʊtˌkrɒp/
    1. part of a rock formation or mineral vein that appears at the surface of the earth
    2. an emergence; appearance
    vb /ˌaʊtˈkrɒp/ ( -crops, -cropping, -cropped)(intransitive)
    1. (of rock strata, mineral veins, etc) to protrude through the surface of the earth

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