1. adjective /ˈfæ.ti,ˈfæ.ɾi/
a) Containing, composed of, or consisting of fat.
Then in the case of excisions you have all kinds of secondary changes, pigmentary disturbances, modifications of the passions, alterations in the secretion of fatty tissue.
That means eating fruits and vegetables and cutting back on fatty foods.
2. noun /ˈfæ.ti,ˈfæ.ɾi/
An obese person.
Wikipedia foundation.