the GNU version of the Collaborative International Dictionary of English
n. The treatment of the teeth so as to make the teeth align properly within the mouth, usually involving the wearing of braces and sometimes oral surgery.
The Century Dictionary and Cyclopedia
n. That branch of dentistry which is concerned with the straightening of irregular teeth.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the branch of dentistry dealing with the prevention or correction of irregularities of the teeth
Word Usage
"My dentist here wanted to put me in orthodontia for 2 years."