athlete's foot

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A contagious fungal skin infection caused by a species of Trichophyton or Epidermophyton that usually affects the feet, especially the skin between the toes, and is characterized by itching, blisters, cracking, and scaling; ringworm of the foot.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun pathology A fungal infection of the skin of the foot, usually between the toes, caused by the pathogen fungi. Scientific name: tinea pedis.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun fungal infection of the feet