- (n.) To form foam or become filled with foam; -- said of a steam boiler when the water is unduly agitated and frothy, as because of chemical action.
- (n.) The white substance, consisting of an aggregation of bubbles, which is formed on the surface of liquids or in the mouth of an animal, by violent agitation or fermentation; froth; spume; scum; as, the foam of the sea.
- (n.) To gather foam; to froth; as, the billows foam.
- (v.t.) To cause to foam; as,to foam the goblet; also (with out), to throw out with rage or violence, as foam.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). foam. Retrieved September 21, 2026, from http://smartdefine.org/foam/definitions/2009033 |
| Chicago | Webster's. 2011. "foam" http://smartdefine.org/foam/definitions/2009033 (accessed September 21, 2026). |
| Harvard | Webster's 2011, foam, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/foam/definitions/2009033>. |
| MLA | Webster's. "foam" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/foam/definitions/2009033> |