6 letters · 10 points in Scrabble
verb gnaw into; make resentful or angry
originFrom Middle English ranklen, ranclen, from Old French rancler, räoncler, draoncler (“to ulcerate, to form a boil”), from Old French draoncle (“a boil”), from Latin dracunculus (“little serpent”), diminutive of Latin dracō (“serpent, dragon”).
Etymology from Wiktionary, CC BY-SA 3.0