A piece of deteriorating bone that has become disconnected during the process of necrosis from a sound bone: When Shanna was walking on the icy street, she slipped and broke her arm and it became necessary that a surgeon remove the sequestrum before she would lose her entire arm.

A medical tool with two long narrow parts, used for holding things during medical operations: Sequestrum forceps have small but strong serrated jaws for removing pieces of skeletal structure that have formed in a fragment of lifeless bone that is separated from that which is in good condition as a result of an injury or a disease.