foam

The definition of foam is a thick frothy lather of bubbles.

(noun)

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.

See foam in Webster's New World College Dictionary

noun

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: ME fom < OE fam, akin to Ger feim, scum < IE base *(s)poimno-, foam > Sans phḗna-, L spuma

intransitive verb

to form, produce, or gather foam; froth

transitive verb

to cause to foam

Related Forms:

See foam in American Heritage Dictionary 4

noun

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.

verb foamed, foam·ing, foams

verb, intransitive

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.

verb, transitive