Definitions

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

  • n. The nucleus of a heavy element. When such nuclei are caused to collide at high velocities, new elements are created.
  • n. A charged microscopic particle that forms when an ion attaches to a dust mote or similar object.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An ionized atom that is usually heavier than helium.

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