柯林斯詞典nebula /?n?bj?l?/ (nebulae) 1. N-COUNT A nebula is a cloud of dust and gas in space. New stars are produced from nebulae. 星雲(yún)[oft in names] 返回 nebula劍橋詞典a cloud of gas or dust in space , appearing either bright or dark 星雲(yún) 返回 nebula