Correct spelling for the English word "proteal" is [pɹˈə͡ʊtə͡l], [pɹˈəʊtəl], [p_ɹ_ˈəʊ_t_əl] (IPA phonetic alphabet).
A vegetable protein prepared for therapeutic use by hypodermic administration.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.