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
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
Gary Baum, HollywoodReporter, 19 Apr. 2025
By suspending the keyboard plate with Gaskets and packing the space with various sound-absorbing foams and silicone, Epomaker has eliminated the hollow echo of some mechanical designs that can cause friction in a shared office.
—Mark Sparrow, Forbes.com, 17 Apr. 2025
Hannah Yasharoff, USA Today, 19 Apr. 2025
The toxic algae leads to the neurotoxin domoic acid to work its way up the food chain, from fish to the sea lions and other marine life that eat them, which then leads to sea lions coming ashore disoriented with their mouths foaming and sometimes dead.
—Luke Harold, San Diego Union-Tribune, 7 Apr. 2025
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
This is followed by, among other special effects, a duck presentation dressed in that quintessential molecular gastronomy topping — foam — while burstable pixelated bubbles float across the table, and a plated course of hamachi and seaweed served as schools of bright fish swim amid coral below.
—Gary Baum, HollywoodReporter, 19 Apr. 2025
By suspending the keyboard plate with Gaskets and packing the space with various sound-absorbing foams and silicone, Epomaker has eliminated the hollow echo of some mechanical designs that can cause friction in a shared office.
—Mark Sparrow, Forbes.com, 17 Apr. 2025
Verb
Some next-level treatments include over-the-counter or prescription medications, such as antacids, foaming agents, histamine (H2) blockers or protein pump inhibitors.
—Hannah Yasharoff, USA Today, 19 Apr. 2025
The toxic algae leads to the neurotoxin domoic acid to work its way up the food chain, from fish to the sea lions and other marine life that eat them, which then leads to sea lions coming ashore disoriented with their mouths foaming and sometimes dead.
—Luke Harold, San Diego Union-Tribune, 7 Apr. 2025
See All Example Sentences for foam
Cite this Entry
“Foam.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/foam. Accessed 24 Apr. 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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