/ fəʊm; NAmE foʊm/ noun , verb
■ noun
1.
(also ˌfoam ˈrubber ) [ U ] a soft light rubber material, full of small holes, that is used for seats, mattresses , etc. :
a foam mattress
foam packaging
2.
[ U ] a mass of very small air bubbles on the surface of a liquid
SYN froth :
a glass of beer with a good head of foam
The breaking waves left the beach covered with foam.
3.
[ U , C ] a chemical substance that forms or produces a soft mass of very small bubbles, used for washing, shaving, or putting out fires, for example :
shaving foam
■ verb
[ v ] ( of a liquid ) to have or produce a mass of small bubbles
SYN froth
•
IDIOMS
- foam at the mouth
••
WORD ORIGIN
Old English fām (noun), fǣman (verb), of West Germanic origin; related to Old High German feim (noun), feimen (verb).