Pharm. Also -in. [f. Gr. θάλλ-ειν to bloom + -INE5.] A trade name for a colorless compound used as an antipyretic, obtained by the reduction of the corresponding chinoline derivative.
Chemically it is tetrahydroparamethoxyquinoline, CH3OC6H2 ∠ CH2 . CH2 / NH . CH2.
1885–8. Fagge & Pye-Smith, Princ. Med. (ed. 2), I. 205. Thallin (the sulphate or tartrate of tetra-hydro-parachinanisol) is, I am disposed to think, as efficient or more so [than Antipyrin], and safer.
1899. Allbutt’s Syst. Med., V. 234.
b. attrib. Thalline periodide, thalline sulphate: see quots.; thalline urine, urine affected by the use of thalline.
1899. Syd. Soc. Lex., Thalline periodide, T. periodosulphate. (Not official.) A combination of iodine and thalline sulphate. Black and crystalline … Thalline sulphate.… The sulphate of a synthetically prepared base derived from chinoline…. A yellowish white crystalline powder, with an odour (like) coumarin, and an aromatic bitter taste.
