# koilonychia

> English word · Noun

## Definitions
1. A deformity of the nails characterized by concavity of the outer surface

## Etymology
From koilo- + onych- + -ia.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/koilonychia