noun Le·o·nar·do da [lee-uh-nahr-doh duh, ley-; Italian le-aw-nahr-daw dah] /ˌli əˈnɑr doʊ də, ˌleɪ-; Italian ˌlɛ ɔˈnɑr dɔ dɑ/. Leonardo da Vinci. nounSee Leonardo da Vinci