A variant or related condition affecting the tissue surrounding the nail region, possibly a rare or specialized pathological term.
From epi- (Greek 'upon') + onynychia, a variant combining onyx 'nail' with -ia (noun suffix). This appears to be a rare or archaic anatomical term with uncertain modern usage.
This word looks like it might be a typo or variant spelling of 'epionychia,' but it might represent a specific medical distinction that's so specialized almost no one uses it anymore! Medical terminology often includes forgotten terms.
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