foam (foams plural & 3rd person present )
1 n-uncount Foam consists of a mass of small bubbles that are formed when air and a liquid are mixed together.
(=froth)
The water curved round the rocks in great bursts of foam.
2 n-mass Foam is used to refer to various kinds of manufactured products which have a soft, light texture like a thick liquid.
(=cream)
...shaving foam.
3 n-mass Foam or foam rubber is soft rubber full of small holes which is used, for example, to make mattresses and cushions.
...modern three-piece suites filled with foam rubber...
4 verb If a liquid foams, it is full of small bubbles and keeps moving slightly.
(=froth)
I let the water run into it and we watched as it foamed and bubbled. V