7 letters · 11 points in Scrabble
noun a distensible membranous sac (usually containing liquid or gas)
noun a bag that fills with air
originFrom Middle English bladdre, bleddre, bladder, bledder, from Old English blæddre, a variant of blǣdre, blēdre (“blister, bladder”), from Proto-West Germanic *blādrā, from Proto-Germanic *blēdrǭ, *bladrǭ (“blister, bladder”).
Etymology from Wiktionary, CC BY-SA 3.0