tetrahydrogestrinone UK /ˌtɛ.tɹəˌhʌɪ.dɹə(ʊ)ˈd͡ʒɛ.stɹɪn.əʊn/US /ˌtɛ.tɹəˌhaɪ.dɹəˈd͡ʒɛ.stɹɪˌnoʊn/ noun1 •A banned anabolic steroid, C₂₁H₂₈O₂. formstetrahydrogestrinones