Webster's English Dictionary

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soap

1. soap \'so-p\ \-.ma--kin\ n [ME sope, fr. OE sa-pe; akin to OHG seifa 
   soap, L sebum] tallow 1: a cleansing and emulsifying agent made usu. by 
   action of alkali on fat o r fatty acids and consisting essentially of 
   sodium or potassium salts of such acids 2: a salt of a fatty acid  - 
   soap.mak.ing n
2. soap vt 1: to rub soap over or into  2: to address in smooth or 
   complimentary speech : FLATTER