Longman Dictionary of Contemporary English homepage

Topic: HOSPITAL

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

orthodontics

noun
     
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
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