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orthodontia (n.)

"the branch of dentistry concerned with the treatment of irregularities of the teeth and jaws," 1849, from ortho- "straight, regular" + Greek odon (genitive odontos) "tooth" (from PIE root *dent- "tooth") + abstract noun ending -ia.

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Definitions of orthodontia from WordNet

orthodontia (n.)
the branch of dentistry dealing with the prevention or correction of irregularities of the teeth;
Synonyms: orthodontics / orthodonture / dental orthopedics / dental orthopaedics
From wordnet.princeton.edu