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a preparation in which the hollow parts such as ducts, vessels, or alveoli of the lung are filled with a substance that hardens and persists after dissolving the tissues by digestion.
Farlex Partner Medical Dictionary © Farlex 2012
In anatomical and pathology investigations, hollow organs and structures such as vessels are filled with a liquid substance that hardens. Then the surrounding tissues are dissolved by use of suitable chemicals. This leaves a cast of the structures.
See also: preparation
Medical Dictionary, © 2009 Farlex and Partners