English · Slang Attested

foam

In real, traceable use. Part of the curated seed collection; community review is coming.

Sense 1

Meaning · English

A substance composed of a large collection of bubbles or their solidified remains, especially

Where it’s used: Used American English

Examples

Similarly, the biotech giant Cargill has begun manufacturing a polymer from vegetable oils that is used in polyurethane foams, which is found in beddings, furniture and car-seat headrests.

Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Sense 2

Meaning · English

A substance composed of a large collection of bubbles or their solidified remains, especially: — A collection of small bubbles created when the surface of a body of water is moved by tides, wind, etc.

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Sense 3

Meaning · English

A substance composed of a large collection of bubbles or their solidified remains, especially: — A collection of small bubbles formed from bodily fluids such as saliva or sweat.

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Common questions

What does “foam” mean?

A substance composed of a large collection of bubbles or their solidified remains, especially

Is “foam” formal or informal?

No register label has been reviewed yet — treat it as neutral and check the usage notes above.