a cipher that replaces letters of the plain text with another set of letters or symbols.
- Substitution product
substitution product n. A product obtained by replacing one atom or group in a molecule with another atom or group.
noun, Chemistry. 1. the replacement of an atom or group of atoms in a compound by another atom or group.
- Substitution therapy
substitution therapy n. Replacement therapy in which a substitute substance is used.
- Substitution transfusion
substitution transfusion n. See exchange transfusion.