Correct spelling for the English word "ossagen" is [ˈɒse͡ɪd͡ʒən], [ˈɒseɪdʒən], [ˈɒ_s_eɪ_dʒ_ə_n] (IPA phonetic alphabet).
Trade name of a preparation of red bone-marrow, recommended in rickets.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.