The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

         Ayin is the most difficult of the faucals. --I. Taylor
                                                  (The
                                                  Alphabet).
   [1913 Webster]

WordNet (r) 3.0 (2006):

faucal
    adj 1: of or relating to the fauces