Royce, Sir Henry Syllabification: (Royce, Sir Henry)Pronunciation: /rois/Definition of Royce, Sir Henry (1863–1933), English engine designer; full name Sir Frederick Henry Royce. He founded Rolls-Royce Ltd. with Charles Stewart Rolls in 1906. Royce, Sir Henry in other Oxford dictionaries Definition of Royce, Sir Henry in the British & World English dictionary