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From: Webster's Revised Unabridged Dictionary (1913)

 Foam 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.
 Foam cock, in steam boilers, a cock at the water level, to blow off impurities.