The Collaborative International Dictionary of English v.0.48:

Phonetic \Pho*net"ic\ (f[-o]*n[e^]t"[i^]k), a. [Gr. fwnhtiko`s,
   fr. fwnh` a sound, tone; akin to Gr. fa`nai to speak: cf. F.
   phon['e]tique. See Ban a proclamation.]
   1. Of or pertaining to the voice, or its use.
      [1913 Webster]

   2. Representing sounds; as, phonetic characters; -- opposed
      to ideographic; as, a phonetic notation.
      [1913 Webster]

   Phonetic spelling, spelling in phonetic characters, each
      representing one sound only; -- contrasted with Romanic
      spelling, or that by the use of the Roman alphabet.
      [1913 Webster]

WordNet (r) 3.0 (2006):

phonetic
    adj 1: of or relating to speech sounds; "phonetic transcription"
           [syn: phonetic, phonic]
    2: of or relating to the scientific study of speech sounds;
       "phonetic analysis"

Moby Thesaurus II by Grady Ward, 1.0:

130 Moby Thesaurus words for "phonetic":
   accented, alveolar, apical, apico-alveolar, apico-dental,
   arrowhead, articulated, assimilated, back, barytone, bilabial,
   broad, cacuminal, central, cerebral, character, checked, close,
   consonant, consonantal, continuant, cuneiform, demotic character,
   dental, descriptive, determinative, dissimilated, dorsal, flat,
   front, glide, glossal, glottal, glottochronological, grammalogue,
   grammatic, graphemic, guttural, hard, heavy, hieratic symbol,
   hieroglyph, hieroglyphic, hieroglyphics, high, hiragana, ideogram,
   ideograph, intonated, kana, katakana, labial, labiodental,
   labiovelar, lateral, lax, lexicographic, lexicological,
   lexicostatistical, light, lingual, linguistic, liquid, logogram,
   logograph, low, metalinguistic, mid, monophthongal, morphological,
   morphophonemic, muted, narrow, nasal, nasalized, occlusive, ogham,
   open, oxytone, palatal, palatalized, pharyngeal, pharyngealized,
   philological, phonemic, phonetic symbol, phonic, phonological,
   pictogram, pictograph, pitch, pitched, posttonic, psycholinguistic,
   radical, retroflex, rounded, rune, semantic, semivowel, shorthand,
   soft, sonant, stopped, stressed, strong, structural, surd,
   syllabic, syntactic, tense, thick, throaty, tonal, tonic, twangy,
   unaccented, unrounded, unstressed, velar, vocalic, vocoid, voiced,
   voiceless, vowel, vowellike, weak, wedge, wide, word letter