Correct spelling for the English word "Tisic" is [tˈɪzɪk], [tˈɪzɪk], [t_ˈɪ_z_ɪ_k] (IPA phonetic alphabet).
Phthisis.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
For phthisic, which see.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.