Rutherford, Sir Ernest Syllabification: (Ruth·er·ford, Sir Ernest)Pronunciation: /ˈrəT͟Hərfərd/Definition of Rutherford, Sir Ernest 1st Baron Rutherford of Nelson (1871–1937), New Zealand physicist, regarded as the founder of nuclear physics. Nobel Prize for Chemistry (1908). Rutherford, Sir Ernest in other Oxford dictionaries Definition of Rutherford, Sir Ernest in the British & World English dictionary