Search Result for "pentimento": 
Wordnet 3.0

NOUN (1)

1. the reappearance in a painting of an underlying image that had been painted over (usually when the later painting becomes transparent with age); 



WordNet (r) 3.0 (2006):

pentimento
    n 1: the reappearance in a painting of an underlying image that
         had been painted over (usually when the later painting
         becomes transparent with age)