sə̇ˈkwestrəm, sēˈk- noun
( plural sequestrums -rəmz ; also seques·tra -rə)
Etymology: New Latin, from Latin, sequestration, deposit, from sequester depositary — more at sequester
: a fragment of dead bone that becomes detached from the sound portion
necrotic fragments of teeth and bone sequestrums — L.R.Cahn
an involucrum forms about a sequestrum in osteomyelitis — C.E.Dunlap
— compare slough III 2a