Meaning of TRAP in English
( n. )
An old term rather loosely used to designate various dark-colored, heavy igneous rocks, including especially the feldspathic-augitic rocks, basalt, dolerite, amygdaloid, etc., but including also some kinds of diorite. Called also trap rock.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012