knoppern

栎鞣汁

词形变化

knopperns 复数 knopperns only 复数

释义与例句

n.
  1. 1.

    A kind of gall (blister on a plant) produced by a gallfly on the cup of an acorn, and formerly used in tanning and dyeing.

    古体 仅复数

词源

Compare German Knopper. See knop.

来源：wiktionary