Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: ortho- 'straight' (from Greek; ORTHODOX) + Greek odous 'tooth'

orthodontics

 noun
     
Related topics: Hospital
or‧tho‧don‧tics [uncountable]
MH the skill or job of helping teeth to grow straight when they have not been growing correctly
—orthodontic adjective:
orthodontic treatment
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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