Definition: a mass of small bubbles formed in or on a liquid
Usage: the beer had a thick head of foam
Main entry: foam
Definition: a lightweight material in cellular form; made by introducing gas bubbles during manufacture
Main entry: effervesce, sparkle, froth, foam, form bubbles, fizz
Definition: become bubbly or frothy or foaming
Usage: The boiling soup was frothing; The river was foaming; Sparkling water