Definition of: foam

(fōm) noun
1. A collection of minute bubbles forming a frothy mass.
2. Chem. A colloid system of gas dispersed in liquid.
3. Frothy saliva or sweat.
4. The white crest of a breaking wave; hence, the sea.
5. Figuratively, rage or fury.
—v.i. To gather, produce, or form foam; froth.
—v.t. To cause to foam. [OE fam]
—foam′less adjective