三叶星云 sānyèxīngyún Trifid Nebula Origin Definitions Defs Strokes Stroke Words Sentences Sents 三 sān numeral three the number three; 3叶 葉 yè noun leaf leaf of a plant; foliage; something resembling a leaf, such as a lobe of a lung or a shutter blade星云 星雲 xīngyún nebula A cloud of gas and dust in outer space visible in the night sky as an indistinct bright patch or as a dark silhouette