planchet (n.)

"metal disk out of which a coin is made," 1610s, from French planchette, literally "a small board," diminutive of Old French planche (12c.), from Late Latin planca "board, slab, plank," probably from Latin plancus "flat, flat-footed," from a nasalized variant of PIE root *plak-(1) "to be flat." The planchette used in automatism and on Ouija boards is a re-borrowing of the French word, 1860.

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