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