from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An early type of nuclear reactor whose core consisted of layers of graphite block interspersed with uranium, designed to create a sustained fission reaction.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. an early nuclear reactor fuelled by uranium and moderated with graphite

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a nuclear reactor that uses controlled nuclear fission to generate energy


atomic + Italian pila, battery (Wiktionary)


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