Webster's English Dictionary

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oratorio

or.a.to.rio \.o.r-*-'to-r-e--.o-, .a:r-, -'to.r-\ n [It, fr. the Oratorio 
   di San Filippo Neri (Oratory of St. Philip Neri) in] Rome : a choral work 
   on a usu. scriptural subject consisting chiefly of recitat ives, arias, and 
   choruses without action or scenery