| Health / Medical Topics |
Concept History
The tracking of concept evolution over the lifetime of a vocabulary, includes concept creation, modification, merges, splits, and retirements. (NCI Thesaurus)
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An assigned code from a defined code system used to represent any type of concept.
The derivation rule between one or more concepts.
Any of the properties, roles, or associations, that define a concept.
A unit of knowledge created by a unique combination of characteristics.
A morphologic finding indicating the presence of fibrosis around an intrahepatic bile duct in the liver tissue.
A device designed to increase the weight per unit volume of a substance, or in communications, a device that combines data streams…
