Collins-Spurrell welsh dictionary - Lewis Henry (1889-1968) (Collins, 1960)
First published in 1848 under title: Geiriadur Cymraeg a Saesonaeg; in 1861, under title: Geiriadur Cymraeg a Seisoneg; and 8th-11th ed. (1922-1937) under title: Geiriadur Saesneg a Chymraeg.