acidific,a.Min.|æsɪˈdɪfɪk|[f.L. acid-um acid + -fic-us making: see -fic.]Applied by Dana to the oxygen, sulphur, selenium, or tellurium, in a mineral, which is an oxygen, sulphur, selenium, or tellurium salt of any basic element.1880DanaMineral.Introd.15Ternary compounds (called also salts and double binaries) consist of elements of three kinds, (1) basic, (2) acidic, (3) acidific. Thus..sulphate of lead contains (1) lead, (2) sulphur, (3) oxygen; the sulphantimonite, jamesonite, contains (1) lead and iron, (2) antimony, (3) sulphur..The replacing power of the elements is in proportion to their combining power, the combining power being reckoned in number of atoms of oxygen (or sulphur, or the acidific element, whatever it may be).