Source : Webster's Revised Unabridged Dictionary (1913)

Froth \Froth\, n. [OE. frothe, Icel. fro[eth]a; akin to Dan.
   fraade, Sw. fradga, AS. [=a]freo[eth]an to froth.]
   1. The bubbles caused in fluids or liquors by fermentation or
      agitation; spume; foam; esp., a spume of saliva caused by
      disease or nervous excitement.

   2. Any empty, senseless show of wit or eloquence; rhetoric
      without thought. --Johnson.

            It was a long speech, but all froth.  --L'Estrange.

   3. Light, unsubstantial matter. --Tusser.

   {Froth insect} (Zo["o]l.), the cuckoo spit or frog hopper; --
      called also {froth spit}, {froth worm}, and {froth fly}.
      

   {Froth spit}. See {Cuckoo spit}, under Cuckoo.

Froth \Froth\, v. t. [imp. & p. p. {Frothed}; p. pr. & vb. n..
   {Frothing}.]
   1. To cause to foam.

   2. To spit, vent, or eject, as froth.

            He . . . froths treason at his mouth. --Dryden.

            Is your spleen frothed out, or have ye more?
                                                  --Tennyson.

   3. To cover with froth; as, a horse froths his chain.

Froth \Froth\, v. i.
   To throw up or out spume, foam, or bubbles; to foam; as beer
   froths; a horse froths.

Source : WordNet®

froth
     n : a mass of small bubbles formed in or on a liquid [syn: {foam}]
     v 1: form bubbles; "The boiling soup was frothing"; "The river
          was foaming"; "Sparkling water" [syn: {foam}, {fizz}, {effervesce},
           {sparkle}]
     2: make froth or foam and become bubbly; "The river foamed"
        [syn: {spume}, {suds}]