9 letters · 11 points in Scrabble
noun an itchy skin eruption characterized by weals with pale interiors and well-defined red margins; usually the result of an allergic response to insect bites or food or drugs
originBorrowed from New Latin urtīcāria, from Latin urtīca (“nettle”) + -āria.
Etymology from Wiktionary, CC BY-SA 3.0