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Related to involucres: Involucral bract


, 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]
Farlex Partner Medical Dictionary © Farlex 2012


, 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.
Medical Dictionary, © 2009 Farlex and Partners


  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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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To accurately assess the overall quality of these potential habitats for spine flowers, it is necessary to multiply our measures of spineflower survivorship and average reproduction of surviving plants (mean involucre number produced per surviving plant) to provide a minimum estimate of per capita seed production per seedling [ILLUSTRATION FOR FIGURE 4 OMITTED].