Meaning of isosterism

i•sos•ter•ism

Pronunciation: (ī-sos'tu-riz"um), [key]
— n.
  1. the quality or state of being isosteric.
  2. the theory that isosteric compounds have identical or similar pharmacological action.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.