planch

[planch, plahnch] /plæntʃ, plɑntʃ/
noun
1.
a flat piece of metal, stone, or baked clay, used as a tray in an enameling oven.
2.
British Dialect.
  1. a floor.
  2. a plank.
Also, planche.
Origin
1300-50; Middle English plaunche < Middle French planche < Latin planca plank