- the whitish mass of bubbles formed on or in liquids by agitation, fermentation, etc.
- something like foam, as the heavy sweat of horses, or frothy saliva
- Old Poet. the sea
- a kind of colloid in which a gas is suspended in a liquid or solid matter, having a texture ranging from soft and liquid, as whipped cream, to firm and elastic, as foam rubber
Origin of foamMiddle English fom from Old English fam, akin to German feim, scum from Indo-European base an unverified form (s)poimno-, foam from source Sanskrit ph?na-, Classical Latin spuma
foam at the mouth