supernumerary
US /ˌsuː.pɚˈnuː.mə.rer.i/
UK /ˌsuː.pɚˈnuː.mə.rer.i/
1.
fazladan
in addition to the number usually needed:
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Supernumerary teeth often are found in the upper jaw just behind the front teeth.
1.
fazladan
an extra employee, actor, member of a society, etc.:
:
•
They're supernumeraries, the people on an opera stage who neither speak nor sing, yet whose presence in the production is crucial.