Correct spelling for the English word "dercetis" is [dˈɜːsɪtˌiz], [dˈɜːsɪtˌiz], [d_ˈɜː_s_ɪ_t_ˌi_z] (IPA phonetic alphabet).
In geol., a ganoid eel-like fish of the chalk formation.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.