American English

Definition of foam noun from the Oxford Advanced American Dictionary



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  1. 1(also foam rubber) [uncountable] a soft, light, rubber material, full of small holes, that is used for seats, mattresses, etc. a foam mattress foam packaging
  2. 2[uncountable] a mass of very small air bubbles on the surface of a liquid synonym froth a glass of beer with a good head of foam The breaking waves left the beach covered with foam.
  3. 3[uncountable, countable] 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 a bottle of bath foam The fire extinguisher directs foam onto the fire.
See the Oxford Advanced Learner's Dictionary entry: foam