Pronunciation: [hɪstˈi͡əɹɪˌak] (IPA)
Correct spelling for the English word "hysteriac" is [hɪstˈi͡əɹɪˌak], [hɪstˈiəɹɪˌak], [h_ɪ_s_t_ˈiə_ɹ_ɪ__ˌa_k] (IPA phonetic alphabet).
An hysterical person.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.