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
Farlex Partner Medical Dictionary © Farlex 2012

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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005