1
: a light frothy mass of fine bubbles formed in or on the surface of a liquid or from a liquid: such as
a
: a frothy mass formed in salivating or sweating
b
: a stabilized froth produced chemically or mechanically and used especially in fighting oil fires
c
: a material in a lightweight cellular form resulting from introduction of gas bubbles during manufacture
2
: sea
3
: something resembling foam
foamed; foaming; foams
1
a
: to produce or form foam
b
: to froth at the mouth especially in anger
broadly
: to be angry
2
: to gush out in foam
3
: to become covered with or as if with foam
streets … foaming with life—
Thomas Wolfe
Thomas Wolfe1
: to cause to foam
specifically
: to cause air bubbles to form in
2
: to convert (something, such as a plastic) into a foam
Synonyms
Examples of foam in a Sentence
Noun
As I poured the beer, foam bubbled up in the glass.
The fire extinguisher is filled with foam.
a can of shaving foam
Verb
The soda foamed in the glass.
The mixture will bubble and foam when you add the yeast.
Recent Examples on the Web
Mark Richard, Harper's Magazine, 2 Jan. 2025
Available in Deep Sea Black and Candle White, the Freq Nami Boot is crafted from a proprietary EVA foam blend known as Nami Wave Foam.
—Cassell Ferere, Forbes, 31 Dec. 2024
Esther K. Choy, Forbes, 15 Dec. 2024
This foaming formula, which effuses notes of warm vanilla and decadent almond, gently cleans the skin with a cocktail of nourishing oils, including castor, grapeseed, avocado, coconut, and sunflower seed for a healthy dose of antioxidants, vitamins, and fatty acids.
—Lauren Dana Ellman, Allure, 30 Nov. 2024
See all Example Sentences for foam 
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Noun
From a reading delivered in November in Richmond, Virginia.
e began to figure it out on day eleven or twelve of the seven-day trip, the slate and obsidian waves rolling under our stern, the crispy hoarfrost of whitecap foam seeding in our beards, the wind spitting ice in our eyes.
—Mark Richard, Harper's Magazine, 2 Jan. 2025
Available in Deep Sea Black and Candle White, the Freq Nami Boot is crafted from a proprietary EVA foam blend known as Nami Wave Foam.
—Cassell Ferere, Forbes, 31 Dec. 2024
Verb
Fong’s observations led the product designers to create a foaming hair dye that was much easier to control.
—Esther K. Choy, Forbes, 15 Dec. 2024
This foaming formula, which effuses notes of warm vanilla and decadent almond, gently cleans the skin with a cocktail of nourishing oils, including castor, grapeseed, avocado, coconut, and sunflower seed for a healthy dose of antioxidants, vitamins, and fatty acids.
—Lauren Dana Ellman, Allure, 30 Nov. 2024
See all Example Sentences for foam
Dictionary Entries Near foam
Cite this Entry
“Foam.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/foam. Accessed 9 Jan. 2025.
Copy CitationKids Definition
foam
1 of 2 noun1
: a light mass of fine bubbles formed in or on a liquid
2
: a mass of fine bubbles formed (as by a horse) in producing saliva or sweating
3
: a long-lasting mass of bubbles produced chemically and used especially in fighting oil fires
4
: a material (as rubber) in a lightweight cellular form resulting from the presence of gas bubbles during manufacture
foamily
adverb
ˈfō-mə-lē
foaminess
noun
ˈfō-mē-nəs
foamy
adjective
-mē
foam
2 of 2 verb1
: to produce or form foam : froth
2
: to be angry
Medical Definition
foam
noun
: a light frothy mass of fine bubbles formed in or on the surface of a liquid
spermicidal foam
foam
verb
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