Correct spelling for the English word "testidin" is [tˈɛstɪdˌɪn], [tˈɛstɪdˌɪn], [t_ˈɛ_s_t_ɪ_d_ˌɪ_n] (IPA phonetic alphabet).
Trade name of a preparation of testicular fluid.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.