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Froth

1. The bubbles caused in fluids or liquors by fermentation or agitation; spume; foam; especially, a spume of saliva caused by disease or nervous excitement.

2. Any empty, senseless show of wit or eloquence; rhetoric without thought. It was a long speech, but all froth. (L'Estrange)

3. Light, unsubstantial matter.

(Science: zoology) froth insect, the cuckoo spit or frog hopper; called also froth spit, froth worm, and froth fly. Froth spit. See Cuckoo spit, under Cuckoo.

Origin: oe. Frothe, Icel. Frooa; akin to dan. Fraade, Sw. Fradga, as. Afreooan to froth.