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Webster's 1828 Dictionary

HYDRACID

a.[Gr. water, and acid. ] An acid formed by the union of hydrogen with a substance without oxygen.

 

Webster's 1913 Dictionary

HYDRACID

Hy *drac "id, n. Etym: [Hydr- + acid: cf. F. hydracide.] (Chem. )

 

Defn: An acid containing hydrogen; -- sometimes applied to distinguish acids like hydrochloric, hydrofluoric, and the like, which contain no oxygen, from the oxygen acids or oxacids. See Acid.