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
Los Angeles Times, 11 July 2025
For ultimate comfort, the loveseat and chairs also include 3.9-inch foam cushions wrapped in soft cotton.
—Alicia Geigel, Southern Living, 8 July 2025
Hannah Howard, Travel + Leisure, 5 July 2025
According to the Harry Potter website, the beverage could be served warm and foaming in tankards or cold in bottles and tasted like a less-sweet butterscotch.
—Diana Leyva, The Tennessean, 2 July 2025
See All Example Sentences for foam
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Noun
There were none on the cardboard boxes containing cups, and it couldn’t be determined if the individual foam products were tagged with recycling labels.
—Los Angeles Times, 11 July 2025
For ultimate comfort, the loveseat and chairs also include 3.9-inch foam cushions wrapped in soft cotton.
—Alicia Geigel, Southern Living, 8 July 2025
Verb
Come for the beloved Sunday dinner and dig into foaming lemon butter asparagus and rhubarb and strawberry short cake.
—Hannah Howard, Travel + Leisure, 5 July 2025
According to the Harry Potter website, the beverage could be served warm and foaming in tankards or cold in bottles and tasted like a less-sweet butterscotch.
—Diana Leyva, The Tennessean, 2 July 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 18 Jul. 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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