foam
1. [ noun ] a mass of small bubbles formed in or on a liquid
Synonyms: froth
Related terms: bubble soapsuds spume shaving_foam lather white_water head
2. [ verb ] form bubbles
Synonyms: fizz effervesce sparkle froth
Examples:

"The boiling soup was frothing" "The river was foaming" "Sparkling water"

Related terms: bubble lather seethe effervescence
3. [ noun ] a lightweight material in cellular form; made by introducing gas bubbles during manufacture
Related terms: material foam_rubber Styrofoam
4. [ verb ] foam as if boiling
Synonyms: seethe
Examples:

"a seething liquid"

5. [ verb ] make froth, become bubbly
Synonyms: spume suds froth
Examples:

"The river foamed"

Related terms: make lather soapsuds
Similar spelling:   foamy
  fohn