One of the mysteries of the English language finally explained.
1A floor of planks or boards (now English regional (East Anglian)). Formerly also: †a platform of planks (obsolete).
2A wooden plank, a board; (also, collectively) planking, boarding. Now English regional (East Anglian).
3In France: the minimum amount of currency in Treasury bills which banks are obliged to hold.
Middle English; earliest use found in Exchequer Accounts. From Anglo-Norman plancher, planchier, plauncher, plauncheour floor, and Old French, Middle French plancher, planchier planking, flooring, floor of a house, ceiling, roof, the floor of a cavity in the body from planche + -er, -ier. Compare post-classical Latin planchera plank, planking, flooring.
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