planchet

[plan-chit]
noun
a flat piece of metal for stamping as a coin; a coin blank.

Origin:
1605–15; planch + -et

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
planchet (ˈplɑːntʃɪt)
 
n
a piece of metal ready to be stamped as a coin, medal, etc; flan
 
[C17: from French: little board, from plancheplank1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

planchet
"metal disk out of which a coin is made," 1611, from Fr. planchette, lit. "a small board," dim. of planche, from O.Fr., from L. planca "board, slab, plank" (see plank). The planchette used in automatism and on Ouija boards is a re-borrowing of the Fr. word, 1860.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The element is deposited on a planchet, and counted with a beta counter.
Leave the planchet in the sample holder when finished.
The element is deposited on a planchet in a thin film and counted with a alpha
  counter.
Hold the planchet centered against the threaded end of the cell and place the
  rubber stopper against the other end of the cell.
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