1. (noun)foam, froth a mass of small bubbles formed in or on a liquid "the beer had a thick head of foam"
2. (noun)foam a lightweight material in cellular form; made by introducing gas bubbles during manufacture
3. (verb)foam, froth, fizz, effervesce, sparkle, form bubbles become bubbly or frothy or foaming "The boiling soup was frothing"; "The river was foaming"; "Sparkling water"
Definition of 'foam'
