valonia

noun

va·​lo·​nia və-ˈlō-nē-ə 

-nyə

: dried acorn cups especially from a Eurasian evergreen oak (Quercus macrolepis synonym Q. aegilops) used in tanning or dressing leather

Word History

Etymology

borrowed from Italian vallonia, vallonea (medieval Upper Italian valania, vallania), borrowed from Middle Greek balanídia, plural of balanídi(on), diminutive of bálanos "acorn," going back to Greek — more at gland entry 1

First Known Use

1722, in the meaning defined above