WordReference Random House Learner's Dictionary of American English © 2017
out•crop /n. ˈaʊtˌkrɑp; v. ˌaʊtˈkrɑp/USA pronunciation   n., v.,  -cropped, -crop•ping. 
n. [countable]
  1. Geology
    • 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]
  1. Geologyto rise suddenly to the surface of the earth, as layers of bedrock.

WordReference Random House Unabridged Dictionary of American English © 2017
out•crop  (n. outkrop′;v. out′krop),USA pronunciation n., v.,  -cropped, -crop•ping. 
n. 
  1. Geology
    • a cropping out, as of a stratum or vein at the surface of the earth.
    • the exposed portion of such a stratum or vein.
  2. something that emerges suddenly or violently in the manner of an outcrop;
    outbreak:an outcrop of student demonstrations.

v.i. 
  1. Geologyto crop out, as strata.
  • noun, nominal use of verb, verbal phrase crop out 1760–70


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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