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; as, the foam of the sea. Foam cock, in steam boilers, a cock at the water level, to blow off impurities.
To gather foam; to froth; as, the billows foam. He foameth, and gnasheth with his teeth. Mark ix. 18.
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.
To cause to foam; as,to foam the goblet; also (with out), to throw out with rage or violence, as foam. "Foaming out their own shame." Jude 13.
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