Webster's English Dictionary

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foam

1. foam \'fo-m\ n [ME fome, fr. OE fa-m; akin to OHG feim foam, L spumaX 
   foam, pumex pumice 1: a light frothy mass of fine bubbles formed in or on 
   the surface of a liq uid : as 1a: such a mass formed in salivating or 
   sweating  1b: a stabilized froth produced chemically or mechanically and 
   used esp. in  fighting oil fires 1c: a material in a lightweight cellular 
   form resulting from introduction o f gas bubbles during manufacture 2: SEA  
   3: something resembling foam 
2. foam vi 1a: to produce or form foam  1b: to froth at the mouth esp. in 
   anger; broadly : to be angry  2: to gush out in foam  1: to cause to foam; 
   specif : to cause air bubbles to form in  2: to convert (as a plastic) into 
   a foam