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Definition of foam

foam

/foʊm/
foam

Plural:foams
•
Adjective:foamy
•
Past Simple:foamed
•
Past Participle:foamed
•
Present Participle:foaming
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foam Lexical Profile

foam Game Scores & Validity

• noun

1

A mass of small bubbles formed on or in liquid, typically by agitation or fermentation.

Example

"The barista expertly steamed the milk until a thick foam formed on top of the cappuccino."


2

A solid, lightweight, cellular material made of a polymer or other substance, often used for insulation, packaging, or cushioning.

Example

"We ordered a new memory foam mattress to help alleviate our back pain."


3

A frothy saliva produced, especially as a symptom of rabies or intense exertion.

Example

"White foam gathered at the corners of the exhausted workhorse's mouth."

Synonyms
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• verb

1

To form or produce a mass of small bubbles; to froth.

Example

"The soapy water began to foam as it rushed rapidly down the narrow drain."


2

To cause a liquid to produce bubbles or froth.

Example

"She foamed the hot milk before pouring it gently over the espresso."


3

To be extremely angry or enraged (often used in the idiom 'to foam at the mouth').

Example

"The manager was practically foaming with rage after discovering the crucial error in the financial report."

Synonyms
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Antonyms
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• Rhymes for foam

Word Origin & Etymology

From Old English 'fām', of Germanic origin; related to Old High German 'feim', from a Proto-Indo-European root meaning 'to boil' or 'froth'.

Usage Trend

Historical frequency of usage in published text.

180019102020

Cite this Entry


Wordmom. (2026). Definition of Foam. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/foam
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