1. (

• foam ,
• froth

) a mass of small bubbles formed in or on a liquid; "the beer had a thick head of foam" ;

2. (

• foam

) a lightweight material in cellular form; made by introducing gas bubbles during manufacture ;

1. (

• foam ,
• froth ,
• fizz ,
• effervesce ,
• sparkle ,
• form_bubbles

) become bubbly or frothy or foaming; "The boiling soup was frothing"; "The river was foaming"; "sparkling water" ;