- a collection of minute bubbles formed on the surface of a liquid by agitation, fermentation, etc.: foam on a glass of beer.
- the froth of perspiration, caused by great exertion, formed on the skin of a horse or other animal.
- froth formed from saliva in the mouth, as in epilepsy and rabies.
- a thick frothy substance, as shaving cream.
- (in firefighting)
- a chemically produced substance that smothers the flames on a burning liquid by forming a layer of minute, stable, heat-resistant bubbles on the liquid's surface.
- the layer of bubbles so formed.
- a dispersion of gas bubbles in a solid, as foam glass, foam rubber, polyfoam, or foamed metal.
- Literary. the sea.
- to form or gather foam; emit foam; froth.
- to cause to foam.
- to cover with foam; apply foam to: to foam a runway before an emergency landing.
- to insulate with foam.
- to make (plastic, metal, etc.) into a foam.
- foam at the mouth, to be extremely or uncontrollably angry.
Origin of foam
SynonymsSee more synonyms for on Thesaurus.com
Examples from the Web for foam
The best example of that would be my first year when Kevin Hart hosted, we wrote a sketch called “Foam Party.”How Aidy Bryant Stealthily Became Your Favorite ‘Saturday Night Live’ Star
October 31, 2014
Near the Mason jars are foam heads, the kind a showgirl uses to style her wigs.Best Career Arc Ever: From Burlesque To Bartending
September 13, 2014
They chew this thing, a real thing, they do this until they foam at the mouth.New York’s Tiniest—and Weirdest—Museum
May 29, 2014
For enthusiasm alone, he's awarded a draft with a two-inch head of foam.The Stacks: The Neville Brothers Stake Their Claim as Bards of the Bayou
John Ed Bradley
April 27, 2014
He thinks he is at the end of a great, sloppy ride falling backwards into the foam.Weed Gave My Family Everything—Then Took It Away
April 9, 2014
Blarney her cliverly, and work her to a foam against the McBrides.Tales And Novels, Volume 8 (of 10)
That tremendous hillside of foam is before my eyes night and day.One Day's Courtship
Nearly every dash of foam brought with it biting bits of seaweed now.The Cruise of the Dry Dock
T. S. Stribling
I think we have now got rid of the Foam, as well as of the gale.
The Foam put her helm down, and tacked beautifully to the south-east.
- a mass of small bubbles of gas formed on the surface of a liquid, such as the froth produced by agitating a solution of soap or detergent in water
- frothy saliva sometimes formed in and expelled from the mouth, as in rabies
- the frothy sweat of a horse or similar animal
- any of a number of light cellular solids made by creating bubbles of gas in the liquid material and solidifying it: used as insulators and in packaging
- (as modifier)foam rubber; foam plastic
- a colloid consisting of a gas suspended in a liquid
- a mixture of chemicals sprayed from a fire extinguisher onto a burning substance to create a stable layer of bubbles which smothers the flames
- a poetic word for the sea
- to produce or cause to produce foam; froth
- (intr) to be very angry (esp in the phrase foam at the mouth)
Word Origin and History for foam
Old English fam "foam, saliva froth," from West Germanic *faimo- (cf. Old High German veim, German Feim), from PIE *(s)poi-mo-, a root with connotations of "foam, froth" (cf. Sanskrit phenah; Latin pumex "pumice," spuma "foam;" Old Church Slavonic pena "foam;" Lithuanian spaine "a streak of foam"). The rubber or plastic variety so called from 1937.
Old English famgian "to foam," from the source of foam (n.). Related: Foamed; foaming.
- Small, frothy bubbles formed in or on the surface of a liquid, as from fermentation or shaking.
- A colloid in which particles of a gas are dispersed throughout a liquid. Compare aerosol emulsion.