1. A species of gall-nut or excrescence, formed by the puncture of an insect on the flower-cups of the oak, used in tanning and dyeing.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• knapper,
• knopper,
• jnoppern,
• mnoppern,
• lnoppern,
• onoppern,
• inoppern,
• kboppern,
• kmoppern,
• kjoppern,
• khoppern,
• knippern,
• knkppern,
• knlppern,
• knoopern,
• knopern,
• Knoperns,
• Knoperen,
• Knopperns,
• Knoppers