Both Uses of

obese
in
The Fountainhead

He was saying to an obese gentlemen with a face turning purple in the heat of an argument: "But, my friend, I might not like it either.†
Chpt 2.6

Everything about the person of Mitchell Layton was almost and not quite, just short of succeeding: his body had started out to be tall, but changed its mind, leaving him with a long torso above short, stocky legs; his face had delicate bones, but the flesh had played a joke on them, puffing out, not enough to achieve obesity, just enough to suggest permanent mumps.†
Chpt 4.6 *

obesity = the state of being significantly overweight (due to the accumulation of body fat)

Definition:

significantly overweight (due to the accumulation of body fat)

Obese is also used figuratively to describe something with large or fat dimensions.