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.

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.

• (chemistry) (of an acid) containing four replaceable hydrogen atoms
  
• (chemistry) (of a salt) having four atoms of a univalent metal