(~s)
1.
Foam consists of a mass of small bubbles that are formed when air and a liquid are mixed together.
The water curved round the rocks in great bursts of ~.
= froth
N-UNCOUNT
2.
Foam is used to refer to various kinds of manufactured products which have a soft, light texture like a thick liquid.
...shaving ~.
= cream
N-MASS
3.
Foam or ~ rubber is soft rubber full of small holes which is used, for example, to make mattresses and cushions.
...modern three-piece suites filled with ~ rubber...
We had given him a large ~ mattress to sleep on.
N-MASS
4.
If a liquid ~s, it is full of small bubbles and keeps moving slightly.
I let the water run into it and we watched as it ~ed and bubbled.
...ravines with ~ing rivers rushing through them.
= froth
VERB: V, V-ing