Correct spelling for the English word "metranoicter" is [mˈɛtɹɐnˌə͡ʊɪktə], [mˈɛtɹɐnˌəʊɪktə], [m_ˈɛ_t_ɹ_ɐ_n_ˌəʊ_ɪ_k_t_ə] (IPA phonetic alphabet).
An instrument by which dilatation of the os uteri is effected by means of two or four blades or branches passed into the os and then separated.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.