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hahnium

American  
[hah-nee-uhm] / ˈhɑ ni əm /

noun

Chemistry, Physics.

  1. a proposed but never officially adopted name for element 105, which was instead named dubnium. Ha

hahnium British  
/ ˈhɑːnɪəm /

noun

  1. a name once advanced by the American Chemical Society for a transuranic element, artificially produced from californium, atomic no: 105; half-life of most stable isotope, 262 Ha: 40 seconds Now called dubnium

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of hahnium

First recorded in 1965–70; named after German chemist Otto Hahn ( def. ); -ium ( def. )

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.