Protactinium

Acceptable For Game Play - US & UK word lists

This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

The American Heritage® Dictionary of the English Language, 4th Edition
  • n. A rare, extremely toxic, radioactive element chemically similar to uranium, having 13 known isotopes, the most common of which is protactinium 231 with a half-life of 32,480 years. Atomic number 91; melting point 1,230°C; specific gravity 15.37; valence 4, 5. See Table at element.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • n. A chemical element (symbol Pa) with atomic number 91.
    • the GNU version of the Collaborative International Dictionary of English
  • The radioactive chemical element, of atomic number 91; Atomic symbol Pa; at. wt. of longest-lived isotope, 231 (T1/2 = 32,500 yrs.) Also called brevium, Uranium X2 and UX2.
    • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • n. a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
    • Hypernym
    Words that are more generic or abstract
    metallic element    metal   
    Form
    eka-protactinium   
     
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