柯林斯詞典orthodontics /???θ???d?nt??/ (also orthodontia) 1. N the branch of dentistry concerned with preventing or correcting irregularities of the teeth 畸齒矯正學(xué) (Also called dental orthopaedics) 返回 orthodontics劍橋詞典the job or activity of correcting the position of teeth and dealing with and preventing problems of the teeth 正牙治療，口腔正畸 返回 orthodontics