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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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
a piece of metal ready to be stamped as a coin, medal, etc; flan
[C17: from French: little board, from planche plank1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a blank metal disk for stamping as a coin.
[1605–15; Middle English plaunche < Middle French planche < Latin planca plank]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.