Correct spelling for the English word "neokharsivan" is [nˈiːə͡ʊkˌɑːsɪvˌan], [nˈiːəʊkˌɑːsɪvˌan], [n_ˈiː__əʊ_k_ˌɑː_s_ɪ_v_ˌa_n] (IPA phonetic alphabet).
Trade name of an English-made substitute for neosalvarsan, employed in the same manner and dosage as the latter.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.