What does uranyl mean?
Uranyl is a technical chemistry term for the divalent uranium(VI) cation UO₂²⁺, commonly represented as the linear uranyl group, and by extension for compounds containing it. Its name combines uranium with the chemical suffix -yl, which is used to form names of radicals and ions. Chemists encounter uranyl in uranium ore analysis, nuclear chemistry, and the naming of compounds such as uranyl nitrate and uranyl acetate. The term is not a synonym for uranium in general: uranyl specifies uranium in a particular oxygen-containing chemical form, while elemental uranium and many other uranium compounds lack that group. Because uranyl describes a distinctive bonding unit rather than merely the presence of uranium, it is useful in structural descriptions, spectroscopy, and coordination chemistry. In ordinary writing the word is uncommon and generally appears in scientific, technical, or industrial contexts, often attributively in compound names.
nounThe divalent uranium(VI) cation or group UO₂²⁺, and by extension a compound containing this uranium–oxygen unit.
- The divalent uranium(VI) cation or group UO₂²⁺, or, by extension, a chemical compound containing this unit.
"Uranyl nitrate was dissolved in water for the laboratory analysis."
"Uranyl nitrate was dissolved in water for the laboratory analysis."
"The vibrational spectrum indicated that the complex contained a uranyl group."
The plural is rare and is used mainly when referring to distinct uranyl groups or entities.
"The two uranyls showed different ligand coordination patterns."
A uranyl group places one uranium(VI) atom between two oxygen atoms, giving uranium compounds a distinctive spectroscopic signature.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does uranyl come from?
Uranyl was formed in English from uranium and the chemical suffix -yl, used in forming names for radicals and ions. It belongs to a family of English uranium derivatives that includes uranic and uranate. Uranium itself was named for the planet Uranus, whose name derives from Greek Ouranos, meaning “heaven” or “sky.”
How uranyl is actually used
Technical and specialist in register. It is commonly used attributively in compound names and is rarely pluralized.
Easily confused with uranyl
Uranium is the chemical element, whereas uranyl specifically denotes the divalent UO₂²⁺ group or compounds containing it.