or·a·to·ry 2 
(ôrə-tôr′ē, ŏr-)
(ôrə-tôr′ē, ŏr-)n. pl. or·a·to·ries
1. A place for prayer, such as a small private chapel.
2. also Oratory
a. A Roman Catholic religious society founded in 1575 by Saint Philip Neri and consisting of secular priests.
b. A branch or church of this society.
[Middle English oratorie, from Old French, from Late Latin ōrātōrium, place of prayer, from Latin, neuter of ōrātōrius, for praying, from ōrāre, to pray.]