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transfermium

American  
[trans-fur-mee-uhm] / trænsˈfɜr mi əm /

adjective

Chemistry.

  1. having an atomic number greater than 100, the atomic number of fermium.

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