Source : Webster's Revised Unabridged Dictionary (1913)

Valonia \Va*lo"ni*a\, n. [It. vallonia, vallonea, fr. NGr.
   balania`, balanidia`, the holm oak, bala`ni, balani`di, an
   acorn, Gr. ba`lanos.]
   1. The acorn cup of two kinds of oak ({Quercus macrolepis},
      and {Q. vallonea}) found in Eastern Europe. It contains
      abundance of tannin, and is much used by tanners and
      dyers.