from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A poisonous compound, OsO4, with a pungent smell, used in solution to stain and fix biological material, especially lipids. Also called osmic acid.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An oxide of the metal osmium, OsO4; it is very poisonous, has a pungent smell and can cause blindness; it is a powerful oxidizing agent, and is used to stain biological materials.
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