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Definition of Supernumerary

Supernumerary: Beyond the normal number, extra. For example, a supernumerary chromosome is an extra one beyond the usual number of 46, and a supernumerary digit is an extra finger or toe.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=5592
Last Editorial Review: 3/19/2012

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