The Collaborative International Dictionary of English v.0.48:

Guttural \Gut"tur*al\, a. [L. guttur throat: cf. F. gutural.]
   Of or pertaining to the throat; formed in the throat;
   relating to, or characteristic of, a sound formed in the
   throat.
   [1913 Webster]

         Children are occasionally born with guttural swellings.
                                                  --W. Guthrie.
   [1913 Webster]

         In such a sweet, guttural accent.        --Landor.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Guttural \Gut"tur*al\, n.
   A sound formed in the throat; esp., a sound formed by the aid
   of the back of the tongue, much retracted, and the soft
   palate; also, a letter representing such a sound.
   [1913 Webster]

WordNet (r) 3.0 (2006):

guttural
    adj 1: like the sounds of frogs and crows; "a guttural voice";
           "acres of guttural frogs" [syn: croaky, guttural]
    2: relating to or articulated in the throat; "the glottal stop
       and uvular `r' and `ch' in German `Bach' are guttural sounds"
    n 1: a consonant articulated in the back of the mouth or throat
         [syn: guttural, guttural consonant, pharyngeal,
         pharyngeal consonant]

Moby Thesaurus II by Grady Ward, 1.0:

168 Moby Thesaurus words for "guttural":
   accented, allophone, alveolar, apical, apico-alveolar,
   apico-dental, articulated, articulation, aspiration, assimilated,
   assimilation, back, barytone, bilabial, blurred, brassy, brazen,
   breathy, broad, cacuminal, central, cerebral, check, checked,
   choked, choking, close, coarse, consonant, consonantal, continuant,
   cracked, croaking, croaky, dental, diphthong, dissimilated,
   dissimilation, dorsal, drawling, drawly, dry, dysphonic,
   epenthetic vowel, explosive, flat, front, glide, glossal, glottal,
   glottalization, gruff, hard, harsh, harsh-sounding, hawking, heavy,
   high, hoarse, husky, inarticulate, indistinct, intonated, labial,
   labialization, labiodental, labiovelar, laryngeal, lateral, lax,
   light, lingual, liquid, lisping, low, manner of articulation,
   metallic, mid, mispronounced, modification, monophthong,
   monophthongal, morphophoneme, mute, muted, muzzy, narrow, nasal,
   nasalized, occlusive, open, oxytone, palatal, palatalized,
   parasitic vowel, peak, pharyngeal, pharyngealization,
   pharyngealized, phone, phoneme, phonemic, phonetic, phonic, pitch,
   pitched, plosive, posttonic, prothetic vowel, quavering, ragged,
   raucid, raucous, retroflex, rough, rounded, roupy, rude,
   segmental phoneme, semivowel, shaking, shaky, snuffling, soft,
   sonant, sonority, speech sound, squawking, squawky, stertorous,
   stifled, stop, stopped, strangled, stressed, strong, surd,
   syllabic, syllabic nucleus, syllabic peak, syllable, tense, thick,
   throaty, tinny, tonal, tonic, transition sound, tremulous,
   triphthong, twangy, unaccented, unrounded, unstressed, velar,
   vocable, vocalic, vocoid, voice, voiced, voiced sound, voiceless,
   voiceless sound, voicing, vowel, vowellike, weak, wide