orthodontics

1 of 2

noun

or·​tho·​don·​tics ˌȯr-thə-ˈdän-tiks How to pronounce orthodontics (audio)
plural in form but singular in construction
: a branch of dentistry dealing with irregularities of the teeth (such as malocclusion) and their correction (as by braces)
also : the treatment provided by a specialist in orthodontics
orthodontic adjective
orthodontically adverb
orthodontist noun

orthodontic

2 of 2

adjective

or·​tho·​don·​tic ¦ȯr-thə-¦dän-tik How to pronounce orthodontic (audio)
: of or relating to orthodontics
orthodontic studies
: involving the methods of orthodontics
orthodontic care of facial abnormalities
orthodontically adverb
That doesn't mean that adults can't have braces. Healthy teeth can be orthodontically treated at any age. Kimberly Gragg, The Asheville (North Carolina) Citizen-Times, 24 June 2014

Word History

Etymology

Adjective

International Scientific Vocabulary orthodont- (from New Latin orthodontia) + -ic

First Known Use

Noun

1909, in the meaning defined above

Time Traveler
The first known use of orthodontics was in 1909

Browse Nearby Words

Cite this Entry

“Orthodontics.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/orthodontics. Accessed 19 Jun. 2026.

Kids Definition

orthodontics

noun
orth·​odon·​tics
ˌȯr-thə-ˈdänt-iks
: a branch of dentistry dealing with faults in the arrangement and placing of teeth and with their correction (as by means of braces)
orthodontic
-ˈdänt-ik
adjective

Medical Definition

orthodontics

noun, plural in form but singular in construction
orth·​odon·​tics -ˈdänt-iks How to pronounce orthodontics (audio)
1
: a branch of dentistry dealing with irregularities of the teeth and their correction (as by means of braces)
2
: the treatment provided by an orthodontist
orthodontic adjective
orthodontically adverb

More from Merriam-Webster on orthodontics

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster