[ peer-ee-od-ik, peer- ]
/ ˈpɪər iˈɒd ɪk, ˌpɪər- /
a system of classification of the elements based on the periodic law.
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Origin of periodic system
First recorded in 1870–75
Words nearby periodic system
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for periodic system
/ (ˌpɪərɪˈɒdɪk) /
the classification of the elements based on the periodic law
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