Applied to a compound of two atoms of hydrogen with an acid radical; denoting dibasic acids regarded as salts of hydrogen, as dihydric sulphate = sulphuric acid H2SO4.
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1876 J. HarleyRoyle's Man. Materia Med. (ed. 6) 187 It..is readily soluble in water acidulated with an excess of citric acid, when the acid or magnesic dihydric citrate is formed.
This entry has not yet been fully updated (first published 1896; most recently modified version published online March 2022).