Wiktionary
sodium stearate
n. (context chemistry English) The sodium salt of stearic acid; a constituent of soap.
Wikipedia
Sodium stearate
Sodium stearate is the sodium salt of stearic acid. This white solid is the most common soap. It is found in many types of solid deodorants, rubbers, latex paints, and inks. It is also a component of some food additives and food flavorings.