Origin of koilonychia

1900–05; < Greek koîl(os) hollow + onych- (stem of ónyx nail; see onyx) + -ia
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koilonychia in Medicine


  1. A nail deformity characterized by concavity of the outer surface of the nail.celonychia spoon nail
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.