Vitruvius Syllabification: (Vi·tru·vi·us)Pronunciation: /vəˈtro͞ovēəs/Definition of Vitruvius (fl. 1st century bc), Roman architect and military engineer; full name Marcus Vitruvius Pollio. He wrote a comprehensive 10-volume treatise on architecture. Vitruvius in other Oxford dictionaries Definition of Vitruvius in the British & World English dictionary