beadboard

English

Etymology

bead +‎ board

Noun

beadboard (usually uncountable, plural beadboards)

1. Wooden boards with a bead or ridge running their length used for paneling walls or ceilings.
   • 2009 July 3, Lisa A. Phillips, “A Jazz Voice Finds a Mellower Range”, in New York Times‎^[1]:

     The aesthetic of the house is prim and country, with white beadboard knee walls around the first floor and pale flowered wallpaper in the Shaker-style kitchen.

2. A construction material made from "beads" of expanded polystyrene compressed together.