History and Etymology
Middle English, "evil spirit," borrowed from Late Latin
daemōn "evil spirit, pagan deity, idol," going back to Latin, "supernatural being, spirit intermediate between humans and gods," borrowed from Greek
daimon-, daímōn "superhuman power, variably evil or beneficent, intervening in human affairs, fate" (Homeric), "personal spirit, bringing luck or ill, that accompanies an individual," "spirit intermediate between humans and gods" (Plato), "evil spirit" (New Testament), probably from
dai-, stem of
daíomai, daíesthai "to divide, allocate" +
-mōn, deverbal noun and adjective suffix — more at
tide entry 1