n. (in full trap-rock) any dark-coloured igneous rock, fine-grained and columnar in structure, esp. basalt.
[ Sw. trapp f. trappa stair, f. the often stairlike appearance of its outcroppings ]
n. (in full trap-rock) any dark-coloured igneous rock, fine-grained and columnar in structure, esp. basalt.
[ Sw. trapp f. trappa stair, f. the often stairlike appearance of its outcroppings ]
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012