出典:Wiktionary
出典:『Wiktionary』 (2026/04/16 19:07 UTC 版)
Unknown according to De Vaan. The old hypothesis deriving it from Proto-Indo-European *kwath₂ (“to ferment, become sour”) has the problem that *w isn't supposed to disappear in Latin (the expected outcome would start with qua- and not ca-). In this case, the cognates listed under *kweth₂- are perhaps loans from the same substrate source as the Latin term.
Alternatively, taking into account Ossetian цыхт (cyxt) (<< Proto-Indo-European *(s)teyg- (“to be sharp; to sting”)), Proto-Indo-European *ḱes- (“to cut”) can be tentatively supposed as an ultimate source of the term; however, the vowel length mismatches.
Second-declension noun.