Source : Webster's Revised Unabridged Dictionary (1913)

Intertrigo \In`ter*tri"go\, n. [L., fr. inter between + terere,
   tritum, to rub.] (Med.)
   A rubbing or chafing of the skin; especially, an abrasion or
   excoriation of the skin between folds, as in fat or neglected
   children.

Source : WordNet®

intertrigo
     n : chafing between two skin surfaces that are in contact (as in
         the armpit or under the breasts or between the thighs)