QUATERNARY PERIOD
\kwətˈɜːnəɹˌɪ pˈi͡əɹɪəd], \kwətˈɜːnəɹˌɪ pˈiəɹɪəd], \k_w_ə_t_ˈɜː_n_ə_ɹ_ˌɪ 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.