Correct spelling for the English word "rodagen" is [ɹˈɒde͡ɪd͡ʒən], [ɹˈɒdeɪdʒən], [ɹ_ˈɒ_d_eɪ_dʒ_ə_n] (IPA phonetic alphabet).
A white powder prepared from the milk of goats from which the thyroid gland has been removed; employed in the treatment of Graves disease and other conditions supposed to be due to hypersecretion of the thyroid gland.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.