Correct spelling for the English word "trimastigate" is [tɹa͡ɪmˈastɪɡˌe͡ɪt], [tɹaɪmˈastɪɡˌeɪt], [t_ɹ_aɪ_m_ˈa_s_t_ɪ_ɡ_ˌeɪ_t] (IPA phonetic alphabet).
Having three fiagella, noting certain protozoans.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.