Froth (?), n. [OE. frothe, Icel. fro[eth]a; akin to Dan. fraade, Sw. fradga, AS. afreo[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 Zool., the cuckoo spit or frog hopper; -- called also froth spit, froth worm, and froth fly. -- Froth spit. See Cuckoo spit, under Cuckoo.
© Webster 1913.
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.
© Webster 1913.
Froth, v. i. To throw up or out spume, foam, or bubbles; to foam; as beer froths; a horse froths.
© Webster 1913. | 
