an optical illusion caused by atmospheric conditions, especially the appearance of a sheet of water in a desert or on a hot road caused by the refraction of light from the sky by heated air 海市蜃楼;幻景 ■something that appears real or possible but is not in fact so 幻想;妄想 to insist that science provides cast-iron knowledge is to believe in a mirage. 坚信科学提供确凿知识等于相信幻想。
语源
early 19th cent.: from French, from se mirer 'be reflected', from Latin mirare 'look at'