Callas, Maria Syllabification: (Cal·las, Maria)Pronunciation: /ˈkaləs/Definition of Callas, Maria (1923–77), US opera singer; born Maria Cecilia Anna Kalageropoulos. She was a coloratura soprano whose bel canto style of singing was especially suited to early Italian opera. Callas, Maria in other Oxford dictionaries Definition of Callas, Maria in the British & World English dictionary