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.

Source: Webster's Revised Unabridged Dictionary (1913)