involucrum definition

  • noun:
    • An enveloping sheath or envelope.
    • A sheath that covers or envelopes, specially one which forms round the sequestrum of the latest bone tissue
    • See Involucre.
    • A sheath which encompasses the base regarding the lasso cells in Siphonophora.
    • In zoology, a type of sheath or involucre towards bases regarding the thread-cells of acalephs.
    • In botany: just like involucre.
    • Same as velum.
    • In pathology, a wall of the latest osseous tissue inclosing the sequestrum in an instance of necrosis.

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