Meaning

noun acute ulceration of the mucous membranes of the mouth or genitals; often seen in undernourished children

originBorrowed from New Latin noma from Latin nomē from Ancient Greek νομή (nomḗ, “spreading (of sores)”) from νέμω (némō, “feed, devour, spread (of sores)”).

Etymology from Wiktionary, CC BY-SA 3.0