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Definition of Supernumerary

Supernumerary: Beyond the normal number. Anything supernumerary is extra.

A supernumerary chromosome is an extra one beyond the usual number of 46. A supernumerary digit is an extra finger or toe. A supernumerary nipple is an extra nipple beyond the usual one on either side. A supernumerary placenta is an extra placenta (afterbirth) and is called an accessory or succenturiate placenta.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=5592
Last Editorial Review: 3/26/1998 2:28:00 PM

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