1. [n]  a mass of small bubbles formed in or on a liquid
2. [n]  a lightweight material in cellular form; made by introducing gas bubbles during manufacture
3. [v]  make froth, become bubbly; "The river foamed"
4. [v]  of liquids; "The boiling soup was frothing"
5. [v]  foam as if boiling; "a seething liquid"

1. \Foam\, n. [OE. fam, fom, AS. f?m; akin to OHG. & G. feim.]
   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.
   
   

2. \Foam\, v.i. [imp. & p. p. {Foamed}; p. pr. & vb. n.
   {Foaming}.] [AS. f?man. See {Foam}, n.]
   1. To gather foam; to froth; as, the billows foam.
   
            He foameth, and gnasheth with his teeth. --Mark ix.
                                                  18.
   
   2. 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.
   
   

3. \Foam\, v.t.
   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.
   
   

(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.