osmium tetroxide

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os·mic ac·id

(oz'mik as'id),
OsO4; a volatile caustic and strong oxidizing agent; colorless crystals, poorly soluble in water, but soluble in organic solvents; the aqueous solution is a fat and myelin stain and a general fixative for electron microscopy.
Synonym(s): osmium tetroxide

osmium tetroxide

n.
A volatile poisonous pale yellow solid, OsO4, with a pungent smell, used as an oxidizing agent and in solution to stain and fix biological material, especially lipids. Also called osmic acid.

osmium tetroxide

or

osmic acid

a substance used in the fixing of cytological preparations that is characterized by the small amount of distortion it causes.

osmium

a chemical element, atomic number 76, atomic weight 190.2, symbol Os. See Table 6.

osmium tetroxide
a pathology stain and fixative; called also osmic acid.