Definition of orthodontics noun from the Oxford Advanced Learner's Dictionary

 

orthodontics

 noun
noun
BrE BrE//ˌɔːθəˈdɒntɪks//
 
; NAmE NAmE//ˌɔːrθəˈdɑːntɪks//
 
[uncountable]
 
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the treatment of problems concerning the position of the teeth and jaws More Like This Uncountable nouns ending in –ics athletics, ballistics, civics, cybernetics, genetics, geophysics, gymnastics, linguistics, optics, orthodontics, orthopaedics, phonetics, phonics, physics, semantics, semiotics, stylistics, thermodynamicsSee worksheet. Word Origin early 20th cent.: from ortho- ‘straight’ + Greek odous, odont- ‘tooth’.
See the Oxford Advanced American Dictionary entry: orthodontics