One of the mysteries of the English language finally explained.
A plain metal disk from which a coin is made.
- ‘The most basic type of planchet error is when the wrong planchet is fed into a press.’
- ‘The leachate was separated from the solids by centrifugation, and the dissolved polonium isotopes in the liquid were plated spontaneously onto a silver planchet.’
Early 17th century: diminutive of earlier planch ‘slab of metal’, from Old French planche ‘plank, slab’.
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