foam [fohm] /foʊm/ Show IPA
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.
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.
verb (used without object)
to form or gather foam; emit foam; froth.
verb (used with object)
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.
before 900; Middle English fom, Old English fām; cognate with German Feim
defoam, verb (used with object)
1. froth, spume, head, fizz; scum.