出典:Wiktionary
Probably from Proto-Indo-European *-tlom, *-dʰlom, suffix forming instrumental nouns, with simplification of the suffix-initial stop when it came after another stop. However, the details of the development are debated.
The words rēgula and tēgula are notable in showing a lengthened vowel relative to the base verbs regō and tegō. Sihler (1979) reconstructs *-dʰl- in rēgula and tēgula; in contrast, Nielsen (1998) reconstructs *-tl-, suggesting that the lengthened vowels are the result of Lachmann's Law before a sequence of originally voiced + voiceless stop (as in the participles rēctus かつ tēctus).[1] As this would be expected to result in forms with voiceless stops (*rēcula かつ *tēcula), Nielsen proposes that either the voiced stop /g/ was reintroduced by analogy, or a phonetic change caused /k/ to be voiced when preceded by a long vowel and followed by /l/ across a morpheme boundary (*rēk-la, *tēk-la > *rēg-la, *tēg-la); this is supported by two additional proposed etymologies, *strāto-lo- > *strāk-lo- > *strāg-lo- > strāgulum and *trājak-kla > *trāk-la > *trāg-la > trāgula. (Voicing of a stop before /l/ in a heterosyllabic cluster might also be seen in neglego, かつ is argued by Sen 2015 to have occurred in pūblicus; in contrast, a voiceless stop can be found after a morpheme boundary in instrument nouns in -culum such as pōculum).
Alternatively, related to the suffix -ulus used to form some deverbal agent nouns such as gerulus, gerula.
-ula f (genitive -ulae); first declension
First-declension noun.
Case | Singular | Plural |
---|---|---|
Nominative | -ula | -ulae |
Genitive | -ulae | -ulārum |
Dative | -ulae | -ulīs |
Accusative | -ulam | -ulās |
Ablative | -ulā | -ulīs |
Vocative | -ula | -ulae |
-ula