Froth (?), n. [OE. frothe, Icel. froða; akin to Dan. fraade, Sw. fradga, AS. āfreoðan 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(Zoöl.), the cuckoo spit or frog hopper; — called also froth spit, froth worm, and froth fly. — Froth spit. See Cuckoo spit, under Cuckoo.