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

If your goal is to get the most omega-3s, choose fattier fish like salmon. — Merve Ceylan, HEALTH, 21 Aug. 2026

Salmon may be easier to eat as a full meal and can still provide a large amount of omega-3s, especially in fattier species like sockeye and Chinook. — Md Published, Verywell Health, 12 Aug. 2026

Noun

The fatty fish in my diet provides DHA (docosahexaenoic acid), an omega-3 fat especially concentrated in the brain and retina. — Renée Onque, CNBC, 22 Aug. 2026

Nature also developed myelin, the fatty sheath around nerve fibers that allows electrical signals to travel up to 100 times faster than through unmyelinated neurons. — Bratin Saha, Forbes.com, 21 Aug. 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