Etymology
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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.

Entries linking to orthodontia

ortho- 

before vowels orth-, word-forming element meaning "straight, upright, rectangular, regular; true, correct, proper," now mostly in scientific and technical compounds, from Greek orthos "straight, true, correct, regular," from PIE *eredh- "high" (source also of Sanskrit urdhvah "high, lofty, steep," Latin arduus "high, steep," Old Irish ard "high").

*dent- 

Proto-Indo-European root meaning "tooth."

It forms all or part of: al dente; dandelion; dental; dentifrice; dentist; dentition; denture; glyptodon; indent (v.1) "to make notches;" mastodon; orthodontia; periodontal; teethe; tooth; toothsome; tusk; trident.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit danta, Greek odontos (gen.), Latin dens, Lithuanian dantis, Old Irish det, Welsh dent, Old English toð, German Zahn, Gothic tunþus "tooth."

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Definitions of orthodontia

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

Dictionary entries near orthodontia

orpiment

orrery

Orson

ort

ortho-

orthodontia

orthodontic

orthodontics

orthodontist

orthodox

orthodoxy

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