eidolon (n.)youdaoicibaDictYouDict[eidolon 词源字典]
1801, "a shade, a specter," from Greek eidolon "appearance, reflection in water or a mirror," later "mental image, apparition, phantom," also "material image, statue, image of a god, idol," from eidos "form, shape" (see -oid). By 1881 in English as "a likeness, an image."[eidolon etymology, eidolon origin, 英语词源]