出典:Wiktionary
出典:『Wiktionary』 (2025/10/02 04:55 UTC 版)
From Latin perpetuum (neutral inflection of perpetuus “perpetual”) + Latin mōbile (neutrum of mōbilis “mobile, moving”), used together as a noun, thus literally meaning “perpetual mover”. Although often said to literally mean “perpetual motion”, the latter in Latin is mōtus perpetuus. A perpetuum mobile is a device that exhibits perpetual motion.
perpetuum mobile (plural perpetua mobilia)
perpetuum mōbile n (genitive perpetuī mōbilis); variously declined, second declension, third declension