Ōr'a-tō'ri-o, n.

n. [It., from Lat. oratorius, belonging to praying; Fr. oratoire. See supra.]

1. (Mus.) A sacred composition consisting of airs, recitatives, duets, trios, choruses, &c., the subject of which is generally taken from the Scriptures.
2. A place of worship; an oratory.