- The usual form, or a composite form, that all others of the class resemble more or less closely; a model, denoting especially a disease or a symptom complex giving the stamp or characteristic to a class.
- In chemistry, a substance in which the arrangement of the atoms in a molecule may be taken as representative of other substances in that class.
- A specific variation of a structure.
Synonym(s): typusTA, variation2
[G. typos, a mark, a model]
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Examples: glitazone, GI cocktail, etc.