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Vinony

osmium tetroxide

noun

  1. 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
L1403754 on Wikidata ↗

Wiktionary

noun

  1. 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.