出典:Wiktionary
出典:『Wiktionary』 (2025/10/18 14:38 UTC 版)
From Latin terra (“Earth”) + -ella, meaning "little Earth". A modern formation: compare classical Latin terrula (“small field”).
terrella (plural terrellas or terrellae)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/01 15:57 UTC 版)
A terrella (meaning "little earth") is a small magnetised model ball representing the Earth, that is thought to have been invented by the English physician William Gilbert while investigating magnetism, and further developed 300 years later by the Norwegian scientist and explorer Kristian Birkeland, while investigating the aurora.