The Collaborative International Dictionary of English v.0.48:

Canticle \Can"ti*cle\, n.; pl. Canticles. [L. canticulum a
   little song, dim. of canticum song, fr. cantus a singing, fr.
   coner to sing. See Chant.]
   1. A song; esp. a little song or hymn. [Obs.] --Bacon.
      [1913 Webster]

   2. pl. The Song of Songs or Song of Solomon, one of the books
      of the Old Testament.
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   3. A canto or division of a poem [Obs.] --Spenser.
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   4. A psalm, hymn, or passage from the Bible, arranged for
      chanting in church service.
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WordNet (r) 3.0 (2006):

Canticles
    n 1: an Old Testament book consisting of a collection of love
         poems traditionally attributed to Solomon but actually
         written much later [syn: Song of Songs, Song of
         Solomon, Canticle of Canticles, Canticles]