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ununoctium

[uhn-uh-nok-tee-uh m]
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noun Chemistry, Physics.
  1. a superheavy, synthetic, radioactive element with a short half-life. Symbol: Uuo; atomic number: 118.
Also called element 118.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018