Noun > Foam

Noun > Foam


1 : a mass of small bubbles that are formed in or on a liquid

As I poured the beer, foam bubbled up in the glass.

2 : a substance that is like a thick liquid made of many small bubbles

The fire extinguisher is filled with foam.

a can of shaving foam

3 : a soft material that is used to make many products : FOAM RUBBER — often used before another noun

a foam mattress/pillow

foaminess noun (noncount)

foamy adjective foamier; foamiest

a foamy glass of beer