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Definition of foam:

  1. 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.
  2. To cause to foam; as, to foam the goblet; also ( with out), to throw out with rage or violence, as foam.
  3. 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. To gather foam; to froth; as, the billows foam.


fizz, head, coruscate, spark, fume, cream, anger, seethe, explode, spume, feelings, effervesce, solid, froth, form bubbles, blow up, yeast, bristle, burn, flare up, boil over, sparkle, rage, scintillate, suds, steam.

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