- The definition of foam is a thick frothy lather of bubbles.
- An example of foam is the white bubbles at the top of a freshly poured glass of beer.
- An example of foam is foamy saliva produced by physical exertion.
A handful of soap foam.
- the whitish mass of bubbles formed on or in liquids by agitation, fermentation, etc.
- something like foam, as the heavy sweat of horses, or frothy saliva
- Old Poet. the sea
- a kind of colloid in which a gas is suspended in a liquid or solid matter, having a texture ranging from soft and liquid, as whipped cream, to firm and elastic, as foam rubber
Origin of foamMiddle English fom ; from Old English fam, akin to German feim, scum ; from Indo-European base an unverified form (s)poimno-, foam from source Sanskrit phḗna-, Classical Latin spuma
foam at the mouth
- A colloidal dispersion of a gas in a liquid or solid medium, such as shaving cream, foam rubber, or a substance used to fight fires. A foam may be produced, especially on the surface of a liquid, by agitation or by a chemical reaction, such as fermentation.
- Any of various light, porous, semirigid or spongy materials, usually the solidified form of a liquid full of gas bubbles, used as a building material or for thermal insulation or shock absorption, as in packaging.
- a. Frothy saliva produced especially as a result of physical exertion or a pathological condition.b. The frothy sweat of a horse or other equine animal.
- The sea.
verbfoamed, foam·ing, foams
- To produce or issue as foam; froth.
- a. To produce foam from the mouth, as from exertion or a pathological condition.b. To be extremely angry; rage: was foaming over the disastrous budget cuts.
- To teem; seethe: a playground foaming with third graders.
- To cause to produce foam.
- To cause to become foam.
Origin of foamMiddle English fom, from Old English fām.
(countable and uncountable, plural foams)
(third-person singular simple present foams, present participle foaming, simple past and past participle foamed)
- To form or emit foam.
From Middle English fom, from Old English fām (“foam”), from Proto-Germanic *faimaz (“foam”), from Proto-Indo-European *poyǝmn-, *spoyǝmn- (“foam”). Cognate with German Feim (“foam”), Latin spūma (“foam”), Latin pūmex (“pumice”), Kurdish fê (“epilepsy”).