| osmium tetroxide | <chemical> Used as a post fixative/stain in electron microscopy. Membranes in particular are osmiophilic, i.e. Bind osmium tetroxide. (18 Nov 1997) |
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| tetroxide | <chemistry> An oxide having four atoms of oxygen in the molecule; a quadroxide; as, osmium tetroxide, OsO. Origin: Tetra- + oxide. Source: Websters Dictionary (01 Mar 1998) |
| lead tetroxide | A bright orange-red powder that turns black when heated; used in ointments and plasters. Synonym: red lead, red oxide of lead. (05 Mar 2000) |