(n.) A provincial name given in England to basaltic rocks, and applied by miners to other kind of dark-colored unstratified rocks which resist the point of the pick. -- for example, to masses of chert. Whin-dikes, and whin-sills, are names sometimes given to veins or beds of basalt.
WHINSTONE
Meaning of WHINSTONE in English
Webster's English dictionary. Английский словарь Webster. 2012