rhizoverbBeta
DictionaryfoamBubbles in liquid
noun / verb

foam

FOHM/fəʊm/

A mass filled with many small gas bubbles.

A thick layer of foam tops the amber liquid in the glass.

A clear glass partly filled with amber liquid, topped by a thick mass of tiny, tightly packed foam bubbles; the transparent sides make the liquid beneath the foam unmistakable.
Etymology
foamOld Englishfoam, froth

Old English fām already named foam or froth, including frothy saliva. The modern liquid-bubble sense preserves that concrete meaning rather than developing through a metaphor.

In context

The Pint Guy0:18
the foam sits like a cap or a crown above the liquid.
Why Is Beer Foam Called The "head" And What Is Its Purpose? - The Pint Guy

More examples

  • The soap foams as she rubs her hands together.
  • Soft foam protects the dishes inside the shipping box.
  • Breaking waves leave white foam along the shore.

Forms

foam · foams · foamed · foaming

foamy adjective — Filled or covered with many small bubbles.

Similar words

froth
Usually describes bubbles on liquids, not solid cellular materials.
lather
Specifically refers to foam produced by soap or detergent.