Sequester
<B>1.</B> In medicine, to set apart, detach or separate a small portion of tissue from the rest.
<B>2.</B> In bone, for a piece of dead bone to separate from the sound bone.
<B>3.</B> In biochemistry, to isolate a constituent of a system by chelation or other means.</P> From the French sequestrer, from the late Latin sequestrare, meaning to place in safe keeping.