Theocritus Syllabification: (The·oc·ri·tus)Pronunciation: /THēˈäkrətəs/Definition of Theocritus (circa 310-circa 250 bc), Greek poet, born in Sicily. He is chiefly known for his Idylls, which were hexameter poems presenting the lives of imaginary shepherds and which became the model for Virgil’s Eclogues. Theocritus in other Oxford dictionaries Definition of Theocritus in the British & World English dictionary