velum definition

  • noun:
    • Biology A covering or partition of slim membranous structure, for instance the veil of a mushroom or a membrane of the brain.
    • Anatomy The soft palate.
    • Zoology A ciliated swimming organ that develops in certain larval phases of many marine gastropod mollusks.
    • A thin membrane layer, resembling a veil, such as for example:
    • An accessory cloud resembling a veil expanding over a big distance. Ordinarily associated with cumulus and cumulonimbus.
    • A curtain or covering; -- placed on different membranous partitions, especially into soft palate. See under Palate.
    • See Veil, n., 3 (b).
    • A thin membrane surrounding the sporocarps of quillworts Isoetes).
    • A veil-like organ or part.
    • The circular membrane layer that partially incloses the space underneath the umbrella of hydroid medusæ.
    • A delicate funnel-like membrane all over flagellum of specific Infusoria. See Illust. a of Protozoa.
    • [capitalized] among subdivisions regarding the constellation Argo Navis. See Argo, 2.
    • identical to velarium, 1.
    • In botany: In Hymenomycetes, a unique membranous envelop which incloses for a while your whole or part of the sporophore.
    • In Isoëtes, the outgrown membranous margin associated with fovea. Also known as involucrum.
    • In Mollusca, the extremely characteristic ciliated development of this embryo, which serves as an organ of locomotion in that phase if the embryo is named a veliger. It will always be soon destroyed, in some cases is forever retained in a modified kind. See slices under veliger.
    • In Hydrozoa, a type of flap or circular free edge which projects inwards around the margin of this disk of several hydrozoans, as those that tend to be bell-shaped or conical, and which from its presence are known as craspedote; a velarium.
    • In Infusoria, a delicate veil-like membrane layer bordering the lips in such kinds as Cyclidium and Pleuronema.
    • In sponges, one of many transverse diaphragms or partitions which constrict the lumen of an incurrent or excurrent canal.
    • In Rotifera, the trochal disk. See slices under trochal, Rotifer, and Rotifera.
    • In entomology, a membrane connected to the inner region of the cubital spur in some bees.
    • In anatomy, a veil, or a component likened to a veil.
    • a membranous covering connected to the immature fruiting human anatomy of particular mushrooms
    • a muscular flap that closes from the nasopharynx during ingesting or talking

Related Sources

  • Definition for "velum"
    • Biology A covering or partition of slim membranous…
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  • Cross Reference for "velum"
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