Definition of planchet
1 : a metal disk to be stamped as a coin
2 : a small metal or plastic disk
Origin of planchet
diminutive of planch flat plate, from Middle French planche
First Known Use: 1611
Medical Definition of planchet
: a small metal disk or plate on which a sample of radioactive material is placed (as for quantitative determination of its reactivity)
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Medical Dictionary: Definition of "planchet"
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