Top Definition
Accessory breasts, also known as polymastia, supernumerary breasts, or mammae erraticae, is the condition of having an additional breast. Extra breasts may appear with or without nipples or areolae.

A related condition, in which extra nipples form, is called "supernumerary nipple" or "polythelia".

Your mother has polymastia.
by chris timmons February 15, 2008

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