Learn how to say Oratorios correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word oratorio:
noun (plural oratorios)
a large-scale, usually narrative musical work for orchestra and voices, typically on a sacred theme, performed without costume, scenery, or action. Well-known examples include Bach’s Christmas Oratorio, Handel’s Messiah, and Haydn’s The Creation.
Italian, from ecclesiastical Latin oratorium ‘oratory’, from the musical services held in the church of the Oratory of St Philip Neri in Rome