—n., v., -cropped, -crop•ping.
a. a cropping out, as of a stratum or vein at the surface of the earth.
b. 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.
to crop out, as strata.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.