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1. A flat disk of metal ready for stamping as a coin; a coin blank.
2. A small shallow metal container in which a radioactive substance is deposited for measurement of its activity.

[ Diminutive of planch, flat plate, slab, from Middle English plaunche, plank, from Old French planche, from Late Latin planca, from feminine of Latin plancus, flat; see plāk- in Indo-European roots.]


a piece of metal ready to be stamped as a coin, medal, etc; flan
[C17: from French: little board, from planche plank1]


(ˈplæn tʃɪt)

a blank metal disk for stamping as a coin.
[1605–15; Middle English plaunche < Middle French planche < Latin planca plank]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.planchet - a flat metal disk ready for stamping as a coin
disk, disc - a flat circular plate
References in classic literature ?
Planchet was not enthroned, as usual, on sacks and barrels.
Planchet left his job directly he received the comte's message.
My dear Planchet," said Athos, pressing the hand of his son, whose sad look he silently observed, - "we are come to learn of you - But in what confusion do I find you
Bon jour, Planchet," replied D'Artagnan, stooping to enter the shop.
Quick, somebody," cried Planchet, "to look after Monsieur d'Artagnan's horse, -- somebody to get ready his room, -- somebody to prepare his supper.
And Planchet breathed freely again, whilst D'Artagnan seated himself quietly down in the shop, upon a bale of corks, and made a survey of the premises.
At your service, sir," said Planchet, overwhelmed with joy; "if I were still capable of serving you.
Sir," said Planchet, "you must know; but, perhaps you ought not to know "
Sir," said the prudent Planchet, "in the first place, are you on good terms with Monsieur de Rochefort?
He preserved this opinion even after the feast, with the remnants of which he repaired his own long abstinence; but when in the evening he made his master's bed, the chimeras of Planchet faded away.
With regard to D'Artagnan, we know how he was lodged, and we have already made acquaintance with his lackey, Master Planchet.
D'Artagnan did reflect, and resolved to thrash Planchet provisionally; which he did with the conscientiousness that D'Artagnan carried into everything.