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]