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foam
/fəʊm/
noun
A substance composed of a large collection of bubbles or their solidified remains.
"He doesn't like so much foam in his beer."
A substance formed by trapping pockets of gas in a liquid or solid.
"A foam mat can soften a hard seat."
(by extension) Sea foam; the sea.
"He is in Europe, across the foam."
verb
To form or emit foam.
To spew saliva as foam, to foam at the mouth.
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