Similarly substituted: used of compounds containing similar atoms or groups in the same position with reference to some other atom or group, as m-chlortoluene and m-bromtoluene.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. of or relating to or having the relation of an isotope
Word Usage
"The fingerprint is the result of a natural phenomenon called isotopic fractionation, in which different isotopes (atoms with different numbers of neutrons) of mercury react to form new compounds at slightly different rates."