The American English form of outcrop, referring to a section of bedrock or ore deposit that protrudes above the surface of the ground. Geologists and hikers use both forms interchangeably in North American usage. The -ing form is simply the gerund used as a noun, a common pattern in geological terminology.
They set up camp near an outcropping of granite that provided good shelter from the wind.
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(US) An outcrop.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.