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Webster's 1913 Dictionary

SEQUESTRUM

Se *ques "trum, n.; pl. Sequestra. Etym: [NL. See Sequester. ] (Med. )

Defn: A portion of dead bone which becomes separated from the sound portion, as in necrosis.

New American Oxford Dictionary

sequestrum

se ques trum |siˈkwestrəm səˈkwɛstrəm | ▶noun ( pl. sequestra |-trə | ) Medicine a piece of dead bone tissue occurring within a diseased or injured bone, typically in chronic osteomyelitis. DERIVATIVES se ques tral |-trəl |adjective, se ques trec to my |ˌsēkweˈstrektəmē |noun ( pl. sequestrectomies ) ORIGIN mid 19th cent.: modern Latin, neuter of Latin sequester ‘standing apart. ’

Oxford Dictionary

sequestrum

sequestrum |sɪˈkwɛstrəm | ▶noun ( pl. sequestra |-trə | ) Medicine a piece of dead bone tissue formed within a diseased or injured bone, typically in chronic osteomyelitis. DERIVATIVES sequestral adjective, sequestrectomy |ˌsiːkwɪˈstrektəmi |noun ( pl. sequestrectomies ) ORIGIN mid 19th cent.: modern Latin, neuter of Latin sequester ‘standing apart ’.