Origin of mathom
- From Old English māþum (“treasure, object of value, jewel, ornament, gift”), from Proto-Germanic *maiþmaz (“present, gift”), from Proto-Indo-European *moyt-, *meyt- (“to exchange”), from Proto-Indo-European *mey- (“to exchange, swap”). Cognate with Gothic (maithms, “gift, present”), Latin mūtō (“change, exchange, barter”). The word survived into Middle English as mathem, madme (“treasure”), but became obsolete thereafter. It was revived by J. R. R. Tolkien in Lord of the Rings.