Correct spelling for the English word "miodidymus" is [mɪˈɒdɪdˌɪməs], [mɪˈɒdɪdˌɪməs], [m_ɪ__ˈɒ_d_ɪ_d_ˌɪ_m_ə_s] (IPA phonetic alphabet).
A monster with two heads partly fused in the occipital region.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.