Struve, Otto Syllabification: (Stru·ve, Otto)Pronunciation: /ˈSHtro͞ovə/Definition of Struve, Otto (1897–1963), US astronomer, born in Russia. In 1938, he discovered the presence of ionized hydrogen in interstellar space. Struve, Otto in other Oxford dictionaries Definition of Struve, Otto in the British & World English dictionary