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orthodontics

or·tho·don·tics

orthodontics

 
pronunciation:
or th dan tihks
features:
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part of speech: plural noun
definition: (used with a singular verb) the branch of dental medicine that deals with the straightening of teeth.
 
derivations: orthodontic (adj.), orthodontist (n.)
Word History
The word orthodontics was coined in 1909. It was formed from orthos and odontos, two ancient Greek words that mean "straight" and "tooth."
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