名詞 orthodontics:

1. the branch of dentistry dealing with the prevention or correction of irregularities of the teeth
   同義詞：orthodontia, orthodonture, dental orthopedics, dental orthopaedics

or.tho.don.tics

n.（名詞）
(used with a sing. verb)The dental specialty and practice of preventing and correcting irregularities of the teeth, as by the use of braces.
（與單數(shù)動詞連用）正牙學，畸齒校正術(shù)：牙科保護和校正不規(guī)則形狀的牙齒的特殊技術(shù)和實踐，如通過支架等

【引伸】
or.thodon.tic
adj.（形容詞）
or.thodon.tically
adv.（副詞）
or.thodon.tist
n.（名詞）