8 letters · 10 points in Scrabble
originFrom Middle French petrinal, alteration of poitrinal, from poitrinal (“of the chest”) (the weapon is thought to have been braced against a chest-pad when firing), from poitrine (“chest, breast”), from Latin pectorina, feminine of pectorinus (“of the breast”) (from pectus (“chest”) + -inus (“-ine”)).
Etymology from Wiktionary, CC BY-SA 3.0