The story
- Middle English · inherited fromwater boarde
- English todaywaterboard
From Middle English water boarde, waterbord, equivalent to water + board. Compare West Frisian wetterboard (“waterboard”), Dutch waterbord (“waterboard”), German Wassertafel (“waterboard”), Danish vandbræt (“waterboard”), Swedish vattenbräda (“waterboard”), Icelandic vatnsbretti (“waterboard”).
Etymology from Wiktionary, CC BY-SA 4.0.