sequest-, sequestr- (Latin: to give up for safe keeping; a depository, trustee; to shut up illegally).sequester: 
To detach abnormally or separate a small portion from the whole.
 
sequestra: 
Plural of sequestrum.
 
sequestral: 
Pertaining to or of the nature of a sequestrum.
 
sequestrant: 
A sequestering agent; such as, for example, cholestyramine resin, that binds bile acids in the intestine, thus preventing their absorption.
 
sequestration: 
1. The formation of a piece of a sequestrum.  
2. The isolation of a patient. 3. A net increase in the quantity of blood within a limited vascular area, occurring physiologically, with or without forward flow persisting, or produced artificially by the application of tourniquets. sequestrectomy, sequestrotomy: 
The surgical removal of a sequestrum.
 
sequestrum: 
A piece of dead bone that has become separated during the process of necrosis from sound bone.
 
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