| Biacid | a. [ Pref. bi- + acid. ] (Chem.) Having two hydrogen atoms which can be replaced by negative atoms or radicals to form salts; -- said of bases. See Diacid. [ 1913 Webster ] |
| Rubiacin | n. [ L. rubia madder, fr. rubeus red. ] (Chem) A substance found in madder root, and probably identical with ruberythrinic acid. [ 1913 Webster ] |