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.
Literary. the sea.
verb (used without object)
to form or gather foam; emit foam; froth.
verb (used with object)
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.

before 900; Middle English fom, Old English fām; cognate with German Feim

foamable, adjective
foamer, noun
foamingly, adverb
foamless, adjective
foamlike, adjective
defoam, verb (used with object)
unfoamed, adjective
unfoaming, adjective

1. froth, spume, head, fizz; scum. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
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.  a.  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
 b.  (as modifier): foam rubber; foam plastic
5.  a colloid consisting of a gas suspended in a liquid
6.  a mixture of chemicals sprayed from a fire extinguisher onto a burning substance to create a stable layer of bubbles which smothers the flames
7.  a poetic word for the sea
8.  to produce or cause to produce foam; froth
9.  (intr) to be very angry (esp in the phrase foam at the mouth)
[Old English fām; related to Old High German feim, Latin spūma, Sanskrit phena]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. fam "foam, saliva froth," from W.Gmc. *faima (cf. O.H.G. veim, Ger. Feim), from PIE *poim(n)o- (cf. Skt. phenah; L. pumex "pumice," spuma "foam;" O.C.S. pena "foam;" Lith. spaine "a streak of foam"). The verb is from O.E. famgian "to foam." The rubber or plastic variety so called from 1937.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
foam  [%PREMIUM_LINK%]     (fōm)  Pronunciation Key 
  1. Small, frothy bubbles formed in or on the surface of a liquid, as from fermentation or shaking.

  2. A colloid in which particles of a gas are dispersed throughout a liquid. Compare aerosol, emulsion.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Bible Dictionary

Foam definition

(Hos. 10:7), the rendering of _ketseph_, which properly means twigs or splinters (as rendered in the LXX. and marg. R.V.). The expression in Hosea may therefore be read, "as a chip on the face of the water," denoting the helplessness of the piece of wood as compared with the irresistable current.

Easton's 1897 Bible Dictionary
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