Y geiriadur mawr = The complete Welsh-English, English-Welshdictionary
By: [compiled by] H. Meurig Evans, W.O. Thomas / golygydd = consulting editor, Stephen J. Williams.
Contributors: Thomas, W. O.; Williams, Stephen J. 1896-
Edition: 15th ed.
Publisher: Christopher Davies; Gwasg Gomer
Published: 1989
Place of publication: Abertawe (Swansea); Llandysul
Language: mul