a. Chem. [f. THALLI-UM + -IC.] Of, pertaining to, or derived from thallium; spec. applied to compounds containing thallium in smaller proportion, relatively to oxygen, than thallious compounds. Thallic oxide = Thallium trioxide, Tl2O3.
1868. Watts, Dict. Chem., V. 750. In solutions of thallic salts, the thallium may be estimated by reducing the thallic to thallious salts with an alkaline sulphite. Ibid. (1873), Fownes’ Chem. (ed. 11), 411. The Trichloride or Thallic Chloride.
