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From The Collaborative International Dictionary of English v.0.48:
Tetrabasic \Tet`ra*bas"ic\, a. [Tetra- + basic.] (Chem.) Capable of neutralizing four molecules of a monacid base; having four hydrogen atoms capable of replacement by bases; quadribasic; -- said of certain acids; thus, normal silicic acid, Si(OH)4, is a tetrabasic acid. [1913 Webster]