SEMIANNUAL
\sˌɛmɪˈanjuːə͡l], \sˌɛmɪˈanjuːəl], \s_ˌɛ_m_ɪ__ˈa_n_j_uː_əl]\
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By James Champlin Fernald
Word of the day
Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.