Definition: Fungal infection of the nail.
Medical terminology: onychomycosis
Have your nails become thick, crumbly, or discoloured? Have your nails become very brittle and have white, black, yellow or green patches? You might be experiencing a fungal infection of the nail. Onychomycosis (fungal infection of the nail) is the most common disease of the nails and may affect toenails or fingernails.