aligner

noun
align·er | \ə-ˈlī-nər\

Medical Definition of aligner 

: a clear, plastic orthodontic appliance that is molded to fit over the teeth and is used to correct their alignment The aligners are made in a series: When the patient's teeth have been moved a tiny bit by one aligner, the next aligner goes in and moves them a bit further.— Fred Reed, The Washington Times, 15 May 2003

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