Cavendish, Henry Syllabification: (Cav·en·dish, Henry)Pronunciation: /ˈkavəndiSH/Definition of Cavendish, Henry (1731–1810), English chemist and physicist. He identified hydrogen, studied carbon dioxide, and determined their densities relative to atmospheric air. Cavendish, Henry in other Oxford dictionaries Definition of Cavendish, Henry in the British & World English dictionary