Meaning of “foam” in the English Dictionary

"foam" in British English

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foamnoun [ U ]

uk /fəʊm/ us /foʊm/

foamverb [ I ]

uk /fəʊm/ us /foʊm/

(Definition of “foam” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"foam" in American English

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foamnoun [ U ]

us /foʊm/

a mass of small, usually white, bubbles formed on the surface of a liquid:

The waves were high and capped with foam.

Foam is also a type of light material made by adding gas bubbles to a liquid, then letting it cool, used esp. in packaging.

foamverb [ I ]

us /foʊm/

to produce a mass of small bubbles:

The suds in the sink foamed up when she added hot water.

(Definition of “foam” from the Cambridge Academic Content Dictionary © Cambridge University Press)