extract is a topic covered in the Taber's Medical Dictionary.

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(eks-trakt′ )

(eks′trakt″ )
[L. extractum, drawn out]

1. To remove by surgery or by force.
2. A solid or semisolid preparation made by removing the soluble portion of a compound by using water or alcohol as the solvent and evaporating the solution.
3. The active principle of a drug obtained by distillation or chemical processes.

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