jǫstr

Old Norse

Etymology

From Proto-Germanic *jestuz. Note that the j- in this word is not etymological, but comes from breaking; in Proto-Norse, j- was always lost word-initially. Thus, the development of the nominative has been *jestuʀ > *estuʀ > *eastuʀ > jǫstr, with U-mutation visible.

Noun

jǫstr m (genitive jastar, dative isti)

  1. yeast
    Synonym: gerð

Declension

Declension of jǫstr (strong u-stem, singular only)
masculine singular
indefinite definite
nominative jǫstr jǫstrinn
accusative jǫst jǫstinn
dative isti istinum
genitive jastar jastarins
  • œsa

Descendants

  • Icelandic: jöstur
  • Norwegian Nynorsk: jester, jest
  • Norwegian Bokmål: jest
  • Old Swedish: iæster

Further reading

  • Zoëga, Geir T. (1910) “jöstr”, in A Concise Dictionary of Old Icelandic, Oxford: Clarendon Press, page 234; also available at the Internet Archive
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