Merthyr-Tydvil, industrial town in Glamorganshire, on the Taff, 15 m. NW. of Cardiff; is the centre of great coal-fields and of enormous iron and steel works, which constitute the only industry.
Population (circa 1900) given as 58,000.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Mersey * Merv