Onychomycosis can be defined as:

A) inflammation of the nail.
B) a fungal nail infection.
C) an infection of the marginal structures around the nail.
D) pertaining to below the nail.

Onychomycosis

A fungal infection of the nail that causes discoloration, thickening, and separation from the nail bed.

Inflammation

The body's immune response to infection or injury, characterized by redness, heat, swelling, and pain.