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trap3

Pronunciation: /trap/

(also traprock)
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Definition of trap

noun

[mass noun] North American
  • basalt or a similar dark, fine-grained igneous rock.

Origin:

late 18th century: from Swedish trapp, from trappa 'stair' (because of the often stair-like appearance of its outcroppings)

trap in other Oxford dictionaries

Definition of trap in the US English dictionary