peri·odon·tal /ˌpɛrioˈdɑntḷ/
  (a.)牙齒周圍的,齒根膜的
  peri·odon·tal /ˌpɛrɪoˈdɑntḷ/ 形容詞
  牙周病,牙槽濃溢,牙周症
  Per·i·o·don·tal a.  Anat. Surrounding the teeth.
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  periodontal
       adj : of or relating to or involving or practicing periodontics;
             "periodontal disease" [syn: periodontic]