knopper

noun knop·per \ ˈnäpə(r) \

Definition of knopper

plural -s
: a gall that is formed by a gall wasp on the leaves and immature acorns of various oaks and that is used in tanning and dyeing

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Origin and Etymology of knopper

German; akin to Old High German knopf knot, bud, knob


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allowing a liquid or gas to pass through

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