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knopper gall

Line breaks: knop|per gall
Pronunciation: /ˈnɒpə/

Entry from British & World English dictionary

Definition of knopper gall in English:

noun

A hard, irregular umbrella-like gall which forms on an oak acorn in response to the developing larva of a gall wasp.
  • The wasp is Andricus quercuscalicis, family Cynipidae

Origin

late 19th century: knopper from German Knopper 'gall'.

Definition of knopper gall in:

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