Source : Webster's Revised Unabridged Dictionary (1913)

Faucal \Fau"cal\, a. [L. fauces throat.]
   Pertaining to the fauces, or opening of the throat; faucial;
   esp., (Phon.) produced in the fauces, as certain deep
   guttural sounds found in the Semitic and some other
   languages.

         Ayin is the most difficult of the faucals. --I. Taylor
                                                  (The
                                                  Alphabet).

Source : WordNet®

faucal
     adj : of or relating to the fauces