Word: knopperns
Part of speech: Noun
Syllables: kno
pperns
Definition: Plural of knoppern
Morphemes:
Affix: knoppern
Language: en
PoS: Noun
Meaning: A kind of gall produced by a gallfly on the cup of an acorn, and formerly used in tanning and dyeing.
Affix: -s
Language: en
PoS: Suffix
Meaning: Used to form many pluralia tantum (nouns that are almost or entirely without singular forms).