TRAPDOOR

\tɹˈapdɔː], \tɹˈapdɔː], \t_ɹ_ˈa_p_d_ɔː]\
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1919 - The Winston Simplified Dictionary
By William Dodge Lewis, Edgar Arthur Singer
 
1894 - The Clarendon dictionary
By William Hand Browne, Samuel Stehman Haldeman

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Quinones

  • Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.
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