HISTORIC PERIOD
\hɪstˈɒɹɪk pˈi͡əɹɪəd], \hɪstˈɒɹɪk pˈiəɹɪəd], \h_ɪ_s_t_ˈɒ_ɹ_ɪ_k p_ˈiə_ɹ_ɪ__ə_d]\
Word of the day
Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.