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tantalous

[tan-tl-uh s]
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adjective Chemistry.
  1. containing trivalent tantalum.
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Origin of tantalous

First recorded in 1865–70; tantal(um) + -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for tantalous

tantalous

adjective
  1. of or containing tantalum in the trivalent state
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Word Origin

C19: from tantal (um) + -ous
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