Mid 17th century; earliest use found in Thomas Blount (1618–1679), antiquary and lexicographer. From post-classical Latin adipalis fatty, greasy from classical Latin adip-, adeps + -ālis.
Definition of adipal in US English:
adipal
adjectiveˈadɪpl
rare
Fat; (in later use) adipose.
Origin
Mid 17th century; earliest use found in Thomas Blount (1618–1679), antiquary and lexicographer. From post-classical Latin adipalis fatty, greasy from classical Latin adip-, adeps + -ālis.