OLEUM AETHEREUM
\ˈə͡ʊliːəm ˌiːθəɹˈiːəm], \ˈəʊliːəm ˌiːθəɹˈiːəm], \ˈəʊ_l_iː__ə_m ˌiː_θ_ə_ɹ_ˈiː__ə_m]\
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A peculiar oleaginous matter, obtained by continuing the distillation, after the whole of the sulphuric ether has passed over in the process for the preparation of the latter. It is used only as an ingredient in the compound spirit of ether. It is official in the Ph. U.S.
By Robley Dunglison
