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spoon nail

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noun Medicine/Medical.
  1. an abnormal condition in which the outer surfaces of the nails are concave; koilonychia.
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Origin of spoon nail

First recorded in 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
spoon nail in Medicine

spoon nail

(spōōn)
n.
  1. koilonychia
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.