or·tho·don·tia

[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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
orthodontics or orthodontia (ˌɔːθəʊˈdɒntɪks, ˌɔːθəʊˈdɒntɪə) [Click for IPA pronunciation guide]
 
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Orthodontia is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Etymonline
Word Origin & History

orthodontia
1849, from ortho- + Gk. dont- (see tooth).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Only mandibular bone grafts performed for other than orthodontia or dental
  support are eligible for benefits.
Thus, it is as invisible to the success of a dinner as the years of orthodontia
  that allowed the diner to chew.
Orthodontia involves teeth straightening and repositioning.
If expenses are for orthodontia, an orthodontia contract must be submitted with
  your first plan year claim.
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