• (a.) Having to hydrogen atoms which can be replaced by positive or basic atoms or radicals to form salts; -- said of acids. See Dibasic.
Bi·ba'sic adjective [ Prefix bi- + basic .] (Chemistry) Having to hydrogen atoms which can be replaced by positive or basic atoms or radicals to form salts; -- said of acids. See Dibasic . 
(formerly) dibasic.