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protoactinium

American  
[proh-toh-ak-tin-ee-uhm] / ˌproʊ toʊ ækˈtɪn i əm /

noun

Chemistry.
  1. protactinium.


protoactinium British  
/ ˌprəʊtəʊækˈtɪnɪəm /

noun

  1. the former name of protactinium

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In shaping the tungsten thread to which the protoactinium clung, he was a little too rough.

From Time Magazine Archive

There they in turn decay, but protoactinium 231 decays faster than thorium 230.

From Time Magazine Archive

Last month Dr. von Grosse asked to have the world supply of protoactinium back for a while so that he could make more photographs.

From Time Magazine Archive

Last week Dr. von Grosse created another stir by revealing that the world supply of protoactinium had unfortunately disappeared.

From Time Magazine Archive

When it slowly decays radioactively, it yields protoactinium 231 and thorium 230, both of which attach themselves to sediment particles and sink slowly to the bottom.

From Time Magazine Archive

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