orthodontia

[awr-thuh-don-shuh, -shee-uh]
noun Dentistry.
2.
treatment for the correction of irregularly aligned teeth, usually involving braces and sometimes oral surgery.

Origin:
1840–50; orth- + -odont + -ia

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
orthodontics or orthodontia (ˌɔːθəʊˈdɒntɪks, ˌɔːθəʊˈdɒntɪə)
 
n
(functioning as singular) Also called: dental orthopaedics the branch of dentistry concerned with preventing or correcting irregularities of the teeth
 
orthodontia or orthodontia
 
n
 
ortho'dontic or orthodontia
 
adj
 
ortho'dontist or orthodontia
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

orthodontia
1849, from ortho- + Gk. dont- (see tooth).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Thus, it is as invisible to the success of a dinner as the years of orthodontia
  that allowed the diner to chew.
She is trying to survive the rigors of academia and adult orthodontia with
  grace.
Orthodontia involves teeth straightening and repositioning.
Only mandibular bone grafts performed for other than orthodontia or dental
  support are eligible for benefits.
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