asteroid
TOEFL小惑星。天文学で
意味
- 星状の
- (またplanetoid)小惑星
- ヒトデ
語源
aster星+-oid〜のような
「星(aster)のような(-oid)」望遠鏡で星のように点に見える天体「小惑星」。
astronomy(天文学)、disaster(悪い星回り→災害)のastも「星」。
英語の原文(Wiktionary)
]Introduced by German–British astronomer William Herschel in 1802 upon the suggestion of classical scholar Charles Burney Jr. (1757–1817), the son of music historian Charles Burney, a friend of Herschel's. Probably coined as a learned borrowing from Ancient Greek ἀστεροειδής (asteroeidḗs, “starlike”), from ἀστήρ (astḗr, “celestial body”) + -ειδής (-eidḗs, adjective-forming suffix). By surface analysis, aster + -oid.