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periodic system

[peer-ee-od-ik, peer-]
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noun Chemistry.
  1. a system of classification of the elements based on the periodic law.

Origin of periodic system

First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for periodic system

periodic system

noun
  1. 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