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orthogenesis
orthogonal
orthogonal matrix
orthogonal projection
orthograde
orthographic
orthographic projection
orthography
orthomorphic
orthopaedic
orthopaedics
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orthophosphate
orthophosphoric acid
orthopsychiatry
orthopteran
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orthodontics

or·tho·don·tics [ àwrthə dóntiks ] or or·tho·don·tia [ àwrthə dónshə ]


noun 
Definition:
 
correction of teeth irregularities: the area of dentistry concerned with the prevention and correction of irregularities of the teeth ( takes a singular verb )


or·tho·don·tic adjective
or·tho·don·tist noun
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