/ ˌɔːθəˈdɒntɪks; NAmE ˌɔːrθəˈdɑːn-/ noun
[ U ] the treatment of problems concerning the position of the teeth and jaws
► ortho·don·tic adjective :
orthodontic treatment
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WORD ORIGIN
early 20th cent.: from ortho- straight + Greek odous , odont- tooth.