froth

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A mass of bubbles in or on a liquid; foam.
2. n. Salivary foam released as a result of disease or exhaustion.
3. n. Something unsubstantial or trivial.
4. n. A fit of resentment or vexation: was in a froth over the long delay.
5. v. To cover with foam.
6. v. To cause to foam.
7. v. To exude or expel foam.

Century Dictionary and Cyclopedia

1. n. The collection of bubbles caused in a liquid by fermentation or agitation; spume; foam.
2. n. Any foamy matter, as the foam at the mouth or on the sides of an over-driven horse.
3. n. Something comparable to froth, as being light, unsubstantial, or evanescent.
4. To foam; give out spume, foam, or foam-like matter.
5. To cause to foam, as beer; cause froth to rise on the top of.
6. To emit or discharge as froth; hence, to vent or give expression to, as what is unsubstantial or worthless: sometimes with out.
7. To cover with froth: as, “the horse froths his bit,”

Wiktionary

1. n. foam
2. n. figuratively unimportant events or actions; drivel
3. v. transitive To create froth.
4. v. intransitive To bubble.

GNU Webster's 1913

1. n. 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. n. Any empty, senseless show of wit or eloquence; rhetoric without thought.
3. n. Light, unsubstantial matter.
4. v. To cause to foam.
5. v. To spit, vent, or eject, as froth.
6. v. To cover with froth.
7. v. To throw up or out spume, foam, or bubbles; to foam; as beer froths; a horse froths.

WordNet 3.0

1. v. exude or expel foam
2. v. make froth or foam and become bubbly
3. n. a mass of small bubbles formed in or on a liquid
4. v. become bubbly or frothy or foaming