n. & v.
--n.
1. a mass of small bubbles formed on or in liquid by agitation, fermentation, etc.
2 a froth of saliva or sweat.
3 a substance resembling these, e.g. rubber or plastic in a cellular mass.
--v.intr.
1. emit foam; froth.
2 run with foam.
3 (of a vessel) be filled and overflow with foam.
Phrases and idioms:
foam at the mouth be very angry.
Derivatives:
foamless adj. foamy adj. (foamier, foamiest ).
Etymology: OE fam f. WG