fatty

1 of 2

adjective

fat·​ty ˈfa-tē How to pronounce fatty (audio)
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

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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Adjective
Sources of fat include oils, nuts, butter, avocados, and fatty fish. Jillian Kubala, Health, 11 Oct. 2025 Over time, injecting insulin in the same place on the body can cause changes in the fatty tissue beneath the skin. Megan Nunn, Verywell Health, 8 Oct. 2025
Noun
Some foods containing vitamin D3 include fatty fish, egg yolks, cod liver oil and fortified dairy and animal foods, health sources confirm. Melissa Rudy, FOXNews.com, 13 Oct. 2025 Sources of fat include oils, nuts, butter, avocados, and fatty fish. Jillian Kubala, Health, 11 Oct. 2025 See All Example Sentences for fatty

Word History

First Known Use

Adjective

14th century, in the meaning defined at sense 1

Noun

1797, in the meaning defined above

Time Traveler
The first known use of fatty was in the 14th century

Browse Nearby Words

Cite this Entry

“Fatty.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fatty. Accessed 22 Oct. 2025.

Kids Definition

fatty

adjective
fat·​ty
ˈfat-ē
fattier; fattiest
1
: containing fat especially in unusual amounts
2
fattiness noun

Medical Definition

fatty

adjective
fat·​ty ˈfat-ē How to pronounce fatty (audio)
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

More from Merriam-Webster on fatty

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!