Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An enveloping sheath or envelope, such as the sheath of new bone that forms around a sequestrum.

from The Century Dictionary.

  • noun In pathology, a wall of new osseous tissue inclosing the sequestrum in a case of necrosis.
  • noun In zoology, a kind of sheath or involucre about the bases of the thread-cells of acalephs.
  • noun In botany: Same as involucre.
  • noun Same as velum.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Bot.) See Involucre.
  • noun (Zoöl.) A sheath which surrounds the base of the lasso cells in the Siphonophora.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A sheath that covers or envelopes, especially one that forms around the sequestrum of new bone

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[New Latin involūcrum, from Latin, wrapper, envelope, from involvere, to enwrap; see involve.]

Examples

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