Medical dictionary. 2011.

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  • unbiunium — noun The systematic element name for the (as yet undiscovered) chemical element with atomic number 121 (symbol Ubu). Syn: eka proactinium …   Wiktionary

  • protactinium — A radioactive element, atomic no. 91, atomic wt. 231.03588, formed in the decay of uranium and thorium; its most long lived isotope, 231Pa, has a half life of 32,500 years. SYN: proactinium, protoactinium. [G. protos, first] …   Medical dictionary

  • UX — uranium X, proactinium …   Medical dictionary

  • UX — • uranium X, proactinium …   Dictionary of medical acronyms & abbreviations

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