- 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.
foam definition by Webster's New World
- 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: Middle 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
- foamless adjective
foam definition by American Heritage Dictionary
- a. A mass of bubbles of air or gas in a matrix of liquid film, especially an accumulation of fine, frothy bubbles formed in or on the surface of a liquid, as from agitation or fermentation.b. A thick chemical froth, such as shaving cream or a substance used to fight fires.
- 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.
- Any of various light, porous, semirigid or spongy materials used for thermal insulation or shock absorption, as in packaging.
- 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: Middle English fom, from Old English fām.
foam - Phrases/Idioms
foam at the mouth
foam - Science Definition