Foam - Definition
foam
n 1: a mass of small bubbles formed in or on a liquid; "the beer
had a thick head of foam" [syn: foam, froth]
2: a lightweight material in cellular form; made by introducing
gas bubbles during manufacture
v 1: become bubbly or frothy or foaming; "The boiling soup was
frothing"; "The river was foaming"; "Sparkling water" [syn:
foam, froth, fizz, effervesce, sparkle, form
bubbles]