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)
- yeast
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 |
Synonyms
- gerð
Related terms
- œsa
Descendants
- Icelandic: jöstur
- Norwegian Nynorsk: jester, jest
- Norwegian Bokmål: jest
- Old Swedish: iæster
- Swedish: jäst
References
- jöstr in A Concise Dictionary of Old Icelandic, G. T. Zoëga, Clarendon Press, 1910, at Internet Archive.