fatty

1 of 2

adjective

fat·​ty ˈfa-tē 

fattier; fattiest

1

: containing fat especially in unusual amounts

fatty foods

also : unduly stout : corpulent

2

: greasy

3

: derived from or chemically related to fat

fattiness noun

fatty

2 of 2

noun

plural fatties

informal

: one that is fat

especially, disparaging + offensive : an overweight person

Synonyms

Adjective

• greasy
• adipose

Examples of fatty in a Sentence

Adjective

I try to avoid fatty foods.

fatty ground beef that was the cheapest available

Recent Examples on the Web

Adjective

And imaging confirmed that the plants were making so many lipids that their cells formed internal pockets containing nothing but fatty materials. —ArsTechnica, 12 Sep. 2025

According to a press release on September 2, LanzaTech has been working with partners to develop a follow-up fermentation process to convert ethanol into fatty oils from which SAF can also be manufactured. —Erik Kobayashi-Solomon, Forbes.com, 10 Sep. 2025

Noun

Another highlight was the graceful Otoro (fatty bluefin belly) nigiri. —Brock Keeling, Oc Register, 22 Sep. 2025

Oily, fatty, and greasy food do not react well to plastic and should be put in better alternatives, like glass, according to our experts. —Ashlyn Needham, Southern Living, 22 Sep. 2025

Word History

First Known Use

Adjective

14th century, in the meaning defined at sense 1

Noun

1797, in the meaning defined above

Rhymes for fatty

• batty
• catty
• chatty
• natty
• pattie
• patty
• ratty
• tatty

Kids Definition

fatty

adjective

fat·​ty

ˈfat-ē

fattier; fattiest

1

: containing fat especially in unusual amounts

2

: greasy sense 2

fattiness noun

Medical Definition

fatty

adjective

fat·​ty ˈfat-ē 

fattier; fattiest

1

a

: unduly stout : corpulent

b

: marked by an abnormal deposit of fat

a fatty liver

fatty cirrhosis

2

: derived from or chemically related to fat

fattiness noun