Catullus, Gaius Valerius Syllabification: (Ca·tul·lus, Gaius Valerius)Pronunciation: /kəˈtələs/Definition of Catullus, Gaius Valerius (circa 84-circa 54 bc), Roman poet, known for his love poems. Catullus, Gaius Valerius in other Oxford dictionaries Definition of Catullus, Gaius Valerius in the British & World English dictionary