Correct spelling for the English word "speltsory" is [spˈɛltsəɹˌi], [spˈɛltsəɹˌi], [s_p_ˈɛ_l_t_s_ə_ɹ_ˌi] (IPA phonetic alphabet).
Aiding in doing something, or privy to it; additional.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.