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
Maya Gandara, StyleCaster, 20 Nov. 2024
The show ends with its own flight of the DeLorean, this time with Santa’s sleigh and a ton of foam snow shot directly toward your seats.
—Jackson McHenry, Vulture, 17 Nov. 2024
Marley Malenfant, Austin American-Statesman, 5 Sep. 2024
That's because it's formulated with nourishing ingredients like castor oil and cocoa butter—and without harsh foaming agents, which can strip your scalp of natural moisture.
—Jennifer Hussein, Allure, 26 Oct. 2024
See all Example Sentences for foam 
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Noun
Each insole features a shock absorbing cork material, a deep heel cup to stabilize your foot, a natural foam for cushioning and custom arch support.
—Maya Gandara, StyleCaster, 20 Nov. 2024
The show ends with its own flight of the DeLorean, this time with Santa’s sleigh and a ton of foam snow shot directly toward your seats.
—Jackson McHenry, Vulture, 17 Nov. 2024
Verb
According to Mayor Ron Jensen, fire crews responded to a warehouse fire on S Avenue around 1 p.m. on Tuesday and utilized a foaming agent to extinguish the flames.
—Marley Malenfant, Austin American-Statesman, 5 Sep. 2024
That's because it's formulated with nourishing ingredients like castor oil and cocoa butter—and without harsh foaming agents, which can strip your scalp of natural moisture.
—Jennifer Hussein, Allure, 26 Oct. 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 1 Dec. 2024.
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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