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illinium

[ih-lin-ee-uh m]
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noun Chemistry. (formerly)
  1. promethium. Symbol: Il
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Origin of illinium

1925–30; named after Illinois; see -ium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for illinium

illinium

noun
  1. chem the former name for promethium
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Word Origin

C20: New Latin, from Illinois + -ium
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