[1] : The Collaborative International Dictionary of English v.0.48

poem \po"em\, n. l. po"ema, gr. ?, fr. ? to make, to compose,
   to write, especially in verse: cf. f. po"eme.
   1. a metrical composition; a composition in verse written in
      certain measures, whether in blank verse or in rhyme, and
      characterized by imagination and poetic diction; --
      contradistinguished from prose; as, the poems of homer or
      of milton.
      1913 webster

   2. a composition, not in verse, of which the language is
      highly imaginative or impassioned; as, a prose poem; the
      poems of ossian.
      1913 webster

[2] : WordNet (r) 2.0

poem
     n : a composition written in metrical feet forming rhythmical
         lines syn: verse form
see also:
verse form 

[3] : Moby Thesaurus II by Grady Ward, 1.0

129 moby thesaurus words for "poem":
   english sonnet, horatian ode, italian sonnet, petrarchan sonnet,
   pindaric ode, sapphic ode, shakespearean sonnet, alba, anacreontic,
   article, autograph, balada, ballad, ballade, brainchild, bucolic,
   canso, chanson, clerihew, composition, computer printout, copy,
   dirge, dithyramb, ditty, document, draft, eclogue, edited version,
   elegy, engrossment, epic, epigram, epithalamium, epode, epopee,
   epopoeia, epos, essay, eyeful, fair copy, fiction, final draft,
   finished version, first draft, flimsy, georgic, ghazel, haiku,
   holograph, idyll, jingle, letter, limerick, literae scriptae,
   literary artefact, literary production, literature, lucubration,
   lyric, madrigal, manuscript, matter, monody, narrative poem,
   nonfiction, nursery rhyme, ode, opus, original, palinode, paper,
   parchment, pastoral, pastoral elegy, pastorela, pastourelle,
   penscript, picture, piece, piece of writing, play, poesy, poetry,
   printed matter, printout, production, prothalamium, reading matter,
   recension, rhapsody, rhyme, rondeau, rondel, roundel, roundelay,
   rune, satire, screed, scrip, script, scrive, scroll, second draft,
   sestina, sloka, song, sonnet, sonnet sequence, tanka, tenso,
   tenzone, the written word, thing of beauty, threnody, transcript,
   transcription, triolet, troubadour poem, typescript, verse,
   verselet, versicle, version, villanelle, virelay, vision, work,
   writing

[4] : Virtual Entity of Relevant Acronyms (Version 1.9, June 2002)

poem
     portable object-orientated entity manager sgml
     
     

Poem >> P Words
Poem, definition of term: Poem
poem_pag1.html

Symphonic Poem >> S Words
Symphonic Poem, definition of term: Symphonic Poem
symphonic+poem_pag1.html

Tone Poem >> T Words
Tone Poem, definition of term: Tone Poem
tone+poem_pag1.html

Prose Poem >> P Words
Prose Poem, definition of term: Prose Poem
prose+poem_pag1.html

Epic Poem >> E Words
Epic Poem, definition of term: Epic Poem
epic+poem_pag1.html

Pastoral Poem >> P Words
Pastoral Poem, definition of term: Pastoral Poem
pastoral+poem_pag1.html

Lyric Poem >> L Words
Lyric Poem, definition of term: Lyric Poem
lyric+poem_pag1.html