Wiktionary
beadboard
n. A construction material made from expanded polystyrene.
Usage examples of "beadboard".
Jeremy despised children-and dirty spiderwebs hung from the peeling beadboard walls.
Oak paneling with a century’s patina ran along the walls above a beadboard wainscot.
He flew off the demolished table and crashed into the beadboard wall, making a splintery dent in that, too.