8 letters · 12 points in Scrabble
noun a rule of evidence whereby a person is barred from denying the truth of a fact that has already been settled
originFrom Middle English *estoppel (found only as stoppel, stoppell, stopple, etc.), probably from Old French estoupail, estopail, estopaille, a bung made of oakum (étoupe), from Latin stuppa ("flax, tow"), from Ancient Greek στύππη (stuppē).
Etymology from Wiktionary, CC BY-SA 3.0