![]()
出典:Wiktionary
出典:『Wiktionary』 (2026/05/17 23:08 UTC 版)
From Latin lībra (“pound”), partially via Italian, Spanish, and Portuguese libra. Doublet of arratel, libbra, Libra, lira, litra, litre, livre, and rottol.
libra (plural libras or (Roman contexts) librae)
Of uncertain origin. The word's original form was something like Proto-Italic *līðrā, *leiðrā (“pound”), surviving also in Ancient Greek λίτρα (lítra), whence English litre.
Weiss derives the term from Proto-Indo-European *leyH- (“to pour”) suffixed with the instrumental/resultative suffix *-dʰrom, under the assumption that the term originally meant "pouring (of metal)" before evolving to mean a unit of weight. In this case, then cognate with Proto-Slavic *lìti (“to pour”), Proto-Celtic *liyeti (“to flow”), Ancient Greek λείβω (leíbō, “to pour”), Lithuanian li̇́eti (“to let flow”).
lībra f (genitive lībrae); first declension
First-declension noun.
| singular | plural | |
|---|---|---|
| nominative | lībra | lībrae |
| genitive | lībrae | lībrārum |
| dative | lībrae | lībrīs |
| accusative | lībram | lībrās |
| ablative | lībrā | lībrīs |
| vocative | lībra | lībrae |
lībrā
![]()