sequestrum
noun
se·ques·trum si-ˈkwe-strəm 
plural sequestrums also sequestra si-ˈkwe-strə
: a fragment of dead bone detached from adjoining sound bone
Word History
Etymology
New Latin, from Latin, legal sequestration, from sequester
First Known Use
1831, in the meaning defined above
Medical Definition
sequestrum
noun
se·ques·trum si-ˈkwes-trəm
plural sequestrums also sequestra -trə
: a fragment of dead bone detached from adjoining sound bone