[ seer-uh s ]
/ ˈsɪər əs /

adjective Chemistry.

containing trivalent cerium.


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Origin of cerous

First recorded in 1860–65; cer(ium) + -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for cerous

British Dictionary definitions for cerous

/ (ˈsɪərəs) /


of or containing cerium in the trivalent state

Word Origin for cerous

C19: from cerium + -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