Source : Webster's Revised Unabridged Dictionary (1913)

Periodontal \Per`i*o*don"tal\, a. [Pref. peri- + Gr. ?, ?,
   tooth.] (Anat.)
   Surrounding the teeth.

Source : WordNet®

periodontal
     adj : of or relating to or involving or practicing periodontics;
           "periodontal disease" [syn: {periodontic}]