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Related to involucre: raceme, pappus


, 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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References in periodicals archive ?
Capitulescences cymose, two- to nine-headed, subterminal to lateral, rarely monocephalous; capitula pedunculate, homogamous, bilabiate, two- to five-flowered; receptacle epaleate; involucre multiseriate, cylindrical, phyllaries glabrous.
Capitulescences monocephalous or in loose to dense apical cymes; capitula short-pedunculate, homogamous, discoid or disciform; receptacle epaleate; involucre multiseriate.
This group of species constitute the genus Cloiselia (Ortiz, 2006a), characterized by corollas much longer than the involucre, disc floret epidermal cell cuticle ornamentation "intestine-like," long simple (not twin) hairs on disc florets corolla, stamen insertion near the corolla base, and pollen echinate, among other characters.