In a fattening way.

In a fatty way.

(pathology) The abnormal retention of triglycerides within the vacuoles of the liver

Somewhat fat

(US standards of identity) Fresh pork fatty tissue, excluding skin, that has been rendered at a temperature not more than 120 degrees Fahrenheit and is pinkish, fresh-looking, and fresh-smelling.

(transitive) To cause to gain weight by means of feeding. / (intransitive) To become fat or fatter by gaining weight. / (transitive, figuratively) To make bigger; to expand.

plural of fatty alcohol

(organic chemistry) Any of a group of long-chain aliphatic alcohols, found in nature esterified with fatty acids in the form of waxes.

(archaic) Third-person singular simple present indicative form of fatten

(archaic) second-person singular simple present form of fatten