noun
a medical term referring to a condition where the nails are abnormally thin and concave
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Koilonychia is a nail disorder characterized by thin, concave-shaped nails.
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My doctor diagnosed me with koilonychia, which explains why my nails are shaped like spoons.
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I hate having koilonychia because my nails look so weird.
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Her koilonychia was a physical manifestation of the stress she was under.