柯林斯詞典planetarium /?pl?n??t??r??m/ (planetariums) 1. N-COUNT A planetarium is a building where lights are shone on the ceiling to represent the planets and the stars and to show how they appear to move. 天文館 返回 planetarium劍橋詞典a building in which moving images of the sky at night are shown using a special machine 天文館 返回 planetarium