from The Century Dictionary.
- noun An oxid which contains in its molecule four atoms of oxygen. Very remarkable examples are presented by ruthenium and osmium tetroxids, RuO4 and OsO4, readily volatile compounds of two of the least fusible and volatile metals.
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Tissue was postfixed in 1\% osmium tetroxid in Sörensen's phosphate buffer for 1 h, washed 3 times and dehydrated in ethanol with increasing concentration: 25, 50, 75 and 96\% for 2×10 min respectively and 100\% for 2×15 min.