foam

US /foʊm/
UK /foʊm/
"foam" picture
1.

a mass of small bubbles formed on or in liquid, typically by agitation or fermentation

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The beer had a thick head of foam.
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Sea foam washed up on the beach.
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frothlathersuds
2.

a lightweight cellular material made from plastic, rubber, or other polymers, used for insulation or packing

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The mattress is made of memory foam.
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They packed the fragile items in protective foam.
:
spongepaddingcushioning
1.

to form or produce a mass of small bubbles

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The waves foamed as they crashed against the rocks.
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The detergent began to foam in the washing machine.
:
frothlatherbubble
:
foam at the mouth