valonia

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va·lo·ni·a

 (və-lō′nē-ə, -lōn′yə) or val·lo·ne·a (-nē-ə)
n.
The dried acorn cups of an oak tree (Quercus macrolepis) of the eastern Mediterranean, used chiefly in tanning and dyeing.

[Italian vallonea, vallonia, from Modern Greek balánia, pl. of baláni, variant of beláni, acorn, from Greek balanos.]

valonia

(vəˈləʊnɪə)
n
(Plants) the acorn cups and unripe acorns of the Eurasian oak Quercus aegilops, used in tanning, dyeing, and making ink
[C18: from Italian vallonia, ultimately from Greek balanos acorn]

va•lo•ni•a

(vəˈloʊ ni ə)

n.pl.
acorn cups of an Old World oak, Quercus macrolepis (or Q. aegilops), used in tanning.
[1715–25; < Italian]