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 Quercus vallonea) found in Eastern Europe. It contains an abundance of tannin, and is much used by tanners and dyers.
2. [Perhaps named from its resemblance to an acorn.]
(Bot.) A genus of marine green alg, in which the whole frond consists of a single oval or cylindrical cell, often an inch in length.
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Fri 14th December 2018