The Collaborative International Dictionary of English v.0.48:

Kyrie eleison \Kyr"i*e e*lei"son\n. & interj. [Gr. ky`rie
   'elei^son .]
   [1913 Webster]
   1. (R. C. Ch.) Greek words, meaning "Lord, have mercy upon
      us," used in the Mass, the breviary offices, the litany of
      the saints, etc. --Addis & Arnold.
      [1913 Webster]

   2. The name given to the response to the Commandments, in the
      service of the Church of England and of the Protestant
      Episcopal Church.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "Kyrie Eleison":
   Agnus Dei, Alleluia, Anamnesis, Angelus, Ave, Ave Maria, Blessing,
   Canon, Collect, Communion, Consecration, Credo, Dismissal, Epistle,
   Fraction, Gloria, Gospel, Gradual, Hail Mary, Introit, Kyrie,
   Last Gospel, Lavabo, Offertory, Paternoster, Pax, Post-Communion,
   Preface, Sanctus, Secreta, Tersanctus, Tract, aid prayer, appeal,
   beadroll, beads, beseechment, bidding prayer, breviary, chaplet,
   collect, communion, contemplation, devotions, entreaty, grace,
   impetration, imploration, intercession, invocation, litany,
   meditation, obsecration, obtestation, orison, petition, prayer,
   prayer wheel, rogation, rosary, silent prayer, suit, supplication,
   thanks, thanksgiving