Chemistry. having the same number of valence electrons in the same configuration but differing in the kinds and numbers of atoms.
Meteorology. having or showing equal atmospheric density.
Origin of isosteric
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
(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
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