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element 117

American  
[el-uh-muhnt wuhn sev-uhn-teen] / ˈɛl ə mənt ˈwʌn ˌsɛv ənˈtin /

noun

  1. Chemistry. tennessine.

element 117 Scientific  

  1. An artificially produced radioactive element whose most stable confirmed isotopes have mass numbers of 293 and 294, with the lighter, more stable isotope having a half-life of less than 80 milliseconds.

  2. Also called ununseptium

  3. See Periodic Table

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.