a. Chem. [f. TITAN-IUM + -OUS.] Containing titanium, spec. in its lower valence, as titanous oxide, sesquioxide of titanium, Ti2O3; contrasted with TITANIC a.2
1866. Roscoe, Elem. Chem., 206. The oxides of titanium correspond to those of tin; viz. titanous and titanic oxides.
1868. Watts, Dict. Chem., V. 842. Titanous oxide dissolves in acids, forming violet solutions. Ibid. (1873), Fownes’ Chem. (ed. 11), 448. Titanous fluoride is obtained as a violet powder by igniting potassio-titanic fluoride in hydrogen gas.
