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Substantiivit

1. (inorganic chemistry, organic chemistry, physical chemistry) A molecule or moiety (ion, functional group, or radical) that binds to another chemical entity to form a larger complex; as, especially:
2. (coordination chemistry) Such an entity that binds to a central metal atom to form a coordination complex.
3. (biochemistry, physiology, pharmacology, medicine) Such an entity that forms a complex with a biomolecule to serve a biological purpose.
4. (typography) A letter that orthography requires or allows to be ligated with one or more other letters to form a ligature, such as a in æ or o in œ.