Source : Webster's Revised Unabridged Dictionary (1913)

D'ebutant \D['e]`bu`tant"\, n.; fem. D'ebutante
\D['e]`bu`tante"\ [F., p. pr. of d['e]buter to have the first
   throw, to make one's d['e]but. See {D['e]but}.]
   A person who makes his (or her) first appearance before the
   public.