The Collaborative International Dictionary
Tetracid
Tetracid \Tet*rac"id\, a. [Tetra + acid.] (Chem.) Capable of neutralizing four molecules of a monobasic acid; having four hydrogen atoms capable of replacement ba acids or acid atoms; -- said of certain bases; thus, erythrine, C4H6(OH)4, is a tetracid alcohol.
Wiktionary
tetracid
a. (context obsolete chemistry English) tetrabasic