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The Collaborative International Dictionary
Bihydroguret

Bihydroguret \Bi`hy*drog"u*ret\, n. [Pref. bi- + hydroguret.] (Chem.) A compound of two atoms of hydrogen with some other substance. [Obs.] [1913 Webster] ||

Wiktionary
bihydroguret

n. (context chemistry obsolete English) A compound of two atoms of hydrogen with some other substance.