The Collaborative International Dictionary of English v.0.48:

Poesy \Po"e*sy\, n. [F. po['e]sie (cf. It. poesia), L. poesis,
   from Gr. ?. from ? to make. Cf. Posy.]
   [1913 Webster]
   1. The art of composing poems; poetical skill or faculty; as,
      the heavenly gift of poesy. --Shak.
      [1913 Webster]

   2. Poetry; metrical composition; poems.
      [1913 Webster]

            Music and poesy used to quicken you.  --Shak.
      [1913 Webster]

   3. A short conceit or motto engraved on a ring or other
      thing; a posy. --Bacon.
      [1913 Webster]

WordNet (r) 3.0 (2006):

poesy
    n 1: literature in metrical form [syn: poetry, poesy,
         verse]

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "poesy":
   Apollo, Apollo Musagetes, Bragi, Calliope, Castilian Spring, Erato,
   Euterpe, Helicon, Hippocrene, Muse, Parnassus, Pierian Spring,
   Pierides, Polyhymnia, afflatus, anthology, bad poetry,
   book of verse, creative imagination, fire of genius, garland,
   inspiration, musical thought, poetastering, poetastery,
   poetic genius, poetic works, poetry, rhyme, rune, song, the Muses,
   the supreme fiction, verse, versemongering