[fohm] 
| 1. | a collection of minute bubbles formed on the surface of a liquid by agitation, fermentation, etc.: foam on a glass of beer. |
| 2. | the froth of perspiration, caused by great exertion, formed on the skin of a horse or other animal. |
| 3. | froth formed from saliva in the mouth, as in epilepsy and rabies. |
| 4. | a thick frothy substance, as shaving cream. |
| 5. | (in firefighting)
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| 6. | a dispersion of gas bubbles in a solid, as foam glass, foam rubber, polyfoam, or foamed metal. |
| 7. | Literary. the sea. |
| 8. | to form or gather foam; emit foam; froth. |
| 9. | to cause to foam. |
| 10. | to cover with foam; apply foam to: to foam a runway before an emergency landing. |
| 11. | to insulate with foam. |
| 12. | to make (plastic, metal, etc.) into a foam. |
| 13. | foam at the mouth, to be extremely or uncontrollably angry. |
foam
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foam (fōm) Pronunciation Key
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foam at the mouth
Be extremely angry, as in She was foaming at the mouth over the judge's ruling. This hyperbolic term uses the verb foam in the sense of "froth at the mouth," a usage generally applied to animals such as horses and dating from about a.d. 950. [1400s]