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isosteric

[ahy-suh-ster-ik]
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adjective
  1. Chemistry. having the same number of valence electrons in the same configuration but differing in the kinds and numbers of atoms.
  2. Meteorology. having or showing equal atmospheric density.
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Origin of isosteric

1860–65; iso- + Greek ster(eós) solid, hard + -ic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for isosteric

isosteric

adjective
  1. (of two different molecules) having the same number of atoms and the same number and configuration of valency electrons, as carbon dioxide and nitrous oxide
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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