noun
Usage: usually capitalized O&R&S
: a thick series of fragmental chiefly sandstone rocks of nonmarine origin, predominantly red in color, and representing the Devonian system in some parts of Great Britain and elsewhere in northwestern Europe
noun
Usage: usually capitalized O&R&S
: a thick series of fragmental chiefly sandstone rocks of nonmarine origin, predominantly red in color, and representing the Devonian system in some parts of Great Britain and elsewhere in northwestern Europe
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012