Meaning

noun conjoining contradictory terms (as in `deafening silence')

originFirst attested in the 17th century, noun use of 5th century Latin oxymōrum (adjective), neut. nom. form of oxymōrus (adjective), from Ancient Greek ὀξύμωρος (oxúmōros), compound of ὀξύς (oxús, “sharp, keen, pointed”) (English oxy-, as in oxygen) + μωρός (mōrós, “dull, stupid, foolish”) (English moron (“stupid person”)). Literally "sharp-dull", "keen-stupid", or "pointed-foolish" – itself an…

Etymology from Wiktionary, CC BY-SA 3.0