Correct spelling for the English word "anideus" is [anˈɪdɪəs], [anˈɪdɪəs], [a_n_ˈɪ_d_ɪ__ə_s] (IPA phonetic alphabet).
Fetus anideus; a shapeless monster; a simple, rounded mass with slight indications of parts.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.