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Related to involucral: bracteole


, pl.


(in'vō-lū'krŭm, -loo'kră),
1. An enveloping membrane, for example, a sheath or sac.
2. The sheath of new bone that forms around a sequestrum.
Synonym(s): involucre
[L. a wrapper, fr. in-volvo, to roll up]


, involucrum (ĭn′vō-lū″kĕr) (ĭn″vō-lū′krŭm) [″ + volvere, to wrap]
1. A sheath or covering.
2. The covering of newly formed bone enveloping the sequestrum in infection of the bone.


  1. a calyx-like structure formed by bracts below the base of a condensed INFLORESCENCE.
  2. a growth of the tissue of the thallus in liverworts (see HEPATICA that covers and protects the ARCHEGONIUM.
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References in periodicals archive ?
Fresh involucral bracts (12 kg) were cut into pieces and repeatedly extracted with EtOH (4 X 51) at room temperature.
30-55 cm long), involucral bracts and primary bracts green or sometimes reddish at their distal portion (vs.
From the Greek hyaleos, of glass, and seris, chicory, lettuce, probably because of the shiny, scarious involucral bracts.
The extinct genus Paleocarpinus from the Paleocene of England, France, and western North America produced flattened, ribbed nutlets between two leafy, involucral bracts (Crane, 1989) that may have been wind dispersed.
The husk is derived from various tissues, including involucral bracts, bracteoles, and, in almonds, the outer portion of the ovary wall (exocarp and mesocarp).
Involucral bracts are often present and effectively perform the function of sepals by protecting the young capitulum as it develops.