foam

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A mass of bubbles of air or gas in a matrix of liquid film, especially an accumulation of fine, frothy bubbles formed in or on the surface of a liquid, as from agitation or fermentation.
2. n. A thick chemical froth, such as shaving cream or a substance used to fight fires.
3. n. Frothy saliva produced especially as a result of physical exertion or a pathological condition.
4. n. The frothy sweat of a horse or other equine animal.
5. n. The sea.
6. n. Any of various light, porous, semirigid or spongy materials used for thermal insulation or shock absorption, as in packaging.
7. v. To produce or issue as foam; froth.
8. v. To produce foam from the mouth, as from exertion or a pathological condition.
9. v. To be extremely angry; rage: was foaming over the disastrous budget cuts.
10. v. To teem; seethe: a playground foaming with third graders.
11. v. To cause to produce foam.
12. v. To cause to become foam.

Century Dictionary and Cyclopedia

1. n. An aggregation of bubbles formed on the surface of water or other liquid by violent agitation or by fermentation; froth; spume: as, the foam of breaking waves; the foam of the mouth.
2. n. The foaming sea; a foaming wave.
3. n. Figuratively, foaming rage; fury.
4. n. In mineralogy, same as aphrite.
5. n. Scum, as from molten metal.
6. To form or gather foam, as water (the crest of a wave), etc., from agitation, a liquor from fermentation, or the mouth from rage or disease; froth; spume.
7. To become filled or covered with foam, as a steam-boiler when the water is frothy.
8. To cause to foam; fill with something that foams; make frothy: as, to foam a tankard.
9. To throw out with rage or violence: usually with out.

Wiktionary

1. n. A substance composed of a large collection of bubbles or their solidified remains.
2. n. by extension sea foam; (figuratively) the sea.
3. v. To form or emit foam.

GNU Webster's 1913

1. n. The white substance, consisting of an aggregation of bubbles, which is formed on the surface of liquids, or in the mouth of an animal, by violent agitation or fermentation; froth; spume; scum.
2. v. To gather foam; to froth.
3. v. To form foam, or become filled with foam; -- said of a steam boiler when the water is unduly agitated and frothy, as because of chemical action.
4. v. To cause to foam; ; also (with out), to throw out with rage or violence, as foam.

WordNet 3.0

1. n. a lightweight material in cellular form; made by introducing gas bubbles during manufacture
2. v. become bubbly or frothy or foaming
3. n. a mass of small bubbles formed in or on a liquid