periodontics
/ˌperɪəʊˈdɒntɪks/pluralnoun
treated as sing.
the branch of dentistry concerned with the structures surrounding and supporting the teeth
牙周病学。
派生词
periodontal
adjective
periodontist
noun 词源
1940s: from
PERI-'around' + Greek
odous, odont- 'tooth' +
-ICS.