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Webster's 1828 Dictionary

POTASSA

n.The scientific name of vegetable alkali or potash.

 

Webster's 1913 Dictionary

POTASSA

Po *tas "sa, n. Etym: [NL. , fr. E. potash. ] (Chem. )(a ) Potassium oxide. [Obs. ] (b ) Potassium hydroxide, commonly called caustic potash.

 

POTASSAMIDE

Pot `ass *am "ide, n. Etym: [Potassium + amide. ] (Chem. )

 

Defn: A yellowish brown substance obtained by heating potassium in ammonia.