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 of fatty

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

Specifically, fatty fish are rich in EPA and DHA, which are types of omega-3 fatty acids that help lower triglycerides (another type of fat in the blood), reduce inflammation, and support healthy heart rhythm, Routhenstein says. —Beth Krietsch, SELF, 22 Jan. 2026

Ryan cuts the meat off the bone, slicing the leaner parts crosswise, then alternating to cutting lengthwise for the fattier end to create more homogenous bites. —Sean Timberlake, Sacbee.com, 20 Jan. 2026

Noun

Antioxidants in fruit and omega-3s in fatty fish are the key ingredients for brain health. —Rahul Jandial, Parents, 18 Jan. 2026

For instance, many studies work by vaporizing samples and analyzing the fumes, but that method cannot reliably tell plastic from fatty tissue, leading to widespread false positives. —Tom Chivers, semafor.com, 14 Jan. 2026

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