Dictionary  foamPronunciation: (fōm), [key] —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. 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. b. the layer of bubbles so formed. 6. a dispersion of gas bubbles in a solid, as foam glass, foam rubber, polyfoam, or foamed metal. 7. Literary.the sea. —v.i. 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. foam at the mouth, to be extremely or uncontrollably angry. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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