WordReference Random House Learner's Dictionary of American English © 2025
foam /foʊm/USA pronunciation   n. [uncountable]
  1. a collection of tiny bubbles on the surface of a liquid:beer with a head of foam.
  2. a thick, frothy substance:A special foam kept the wreckage from catching on fire.
  3. Chemistrya lightweight material in which gas bubbles are dispersed in a solid, used as insulation.

v. [no object]
  1. to form foam;
    froth:The boiling milk foamed.
Idioms
  1. Idioms foam at the mouth, [no obj] to be extremely angry:almost foaming at the mouth at the insult.

foam•y, adj., -i•er, -i•est. 

WordReference Random House Unabridged Dictionary of American English © 2025
foam  (fōm),USA pronunciation n. 
  1. a collection of minute bubbles formed on the surface of a liquid by agitation, fermentation, etc.:foam on a glass of beer.
  2. the froth of perspiration, caused by great exertion, formed on the skin of a horse or other animal.
  3. froth formed from saliva in the mouth, as in epilepsy and rabies.
  4. a thick frothy substance, as shaving cream.
  5. (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.
  6. Chemistrya dispersion of gas bubbles in a solid, as foam glass, foam rubber, polyfoam, or foamed metal.
  7. [Literary.]the sea.

v.i. 
  1. to form or gather foam;
    emit foam;
    froth.

v.t. 
  1. to cause to foam.
  2. to cover with foam;
    apply foam to:to foam a runway before an emergency landing.
  3. to insulate with foam.
  4. to make (plastic, metal, etc.) into a foam.
  5. Idioms foam at the mouth, to be extremely or uncontrollably angry.
  • bef. 900; Middle English fom, Old English fām; cognate with German Feim
foama•ble, adj. 
foamer, n. 
foaming•ly, adv. 
foamless, adj. 
foamlike′, adj. 
    • 1.See corresponding entry in Unabridged froth, spume, head, fizz; scum.

Collins Concise English Dictionary © HarperCollins Publishers::
foam / fəʊm/
  1. 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
  2. frothy saliva sometimes formed in and expelled from the mouth, as in rabies
  3. the frothy sweat of a horse or similar animal
  4. 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
  5. (as modifier): foam rubber, foam plastic
  6. a poetic word for the sea
  1. to produce or cause to produce foam; froth
  2. (intransitive) to be very angry (esp in the phrase foam at the mouth)
Etymology: Old English fām; related to Old High German feim, Latin spūma, Sanskrit phenaˈfoamless
'foaming' also found in these entries (note: many are not synonyms or translations):

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