From Longman Dictionary of Contemporary Englishorthodontistor‧tho‧don‧tist /ˌɔːθəˈdɒntɪst $ ˌɔːrθəˈdɑːn-/ noun [countable] MNa dentist whose job is to help teeth to grow straight when they have not been growing correctly
Examples from the Corpus
orthodontist• But nothing that a good dietitian and orthodontist couldn't put right. 