isostere

noun
iso·​stere | \ˈī-sə-ˌsti(ə)r \
variants: also isoster \ˈī-​sə-​ˌster \

Medical Definition of isostere 

: one of two or more substances (as carbon monoxide and molecular nitrogen) that exhibit similarity of some properties as a result of having the same number of total or valence electrons in the same arrangement and that consist of different atoms and not necessarily the same number of atoms

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