Definition of paronychia
medical
: inflammation of the tissues adjacent to the nail of a finger or toe usually accompanied by infection and pus formation
… chronic paronychia may be related to factors causing a localized inflammatory reaction. These factors may be frequent contact with chemicals, chronic dishwashing, finger sucking as well as the effects of certain medications.— J. Keith Festa Paronychia, a painful infection, can creep under the skin around your nails when the cuticle breaks down, so slather cream around fingertips, too.— Holly E. Thomas and Michelle Thomas
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Merriam-Webster unabridged
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Time Traveler for paronychia
The first known use of paronychia was in 1559
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