velum

Definitions

  • BULLA VELUM
    BULLA VELUM
  • WordNet 3.6
    • n velum a muscular flap that closes off the nasopharynx during swallowing or speaking
    • n velum a membranous covering attached to the immature fruiting body of certain mushrooms
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Webster's Revised Unabridged Dictionary
    • Velum (Anat) A curtain or covering; -- applied to various membranous partitions, especially to the soft palate. See under Palate.
    • Velum (Zoöl) A delicate funnel-like membrane around the flagellum of certain Infusoria. See Illust.a of Protozoa.
    • Velum (Bot) A thin membrane surrounding the sporocarps of quillworts Isoetes).
    • Velum A veil-like organ or part.
    • Velum (Bot) See Veil n., 3 .
    • Velum (Zoöl) The circular membrane that partially incloses the space beneath the umbrella of hydroid medusæ.
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Century Dictionary and Cyclopedia
    • n velum [capitalized] One of the subdivisions of the constellation Argo Navis. See Argo, 2.
    • n velum Same as velarium, 1.
    • n velum In botany: In Hymenomycetes, a special membranous envelop which incloses for a time the whole or a part of the sporophore. When it extends as a horizontal membrane from the margin of the pileus to the stipe, it is called a velum partiale or marginal veil. It is ruptured by the expanding pileus, when it forms the annulus or ring on the stipe. When the velum is a sac which incloses the whole of the sporophore, it is called a velum universale, or volva. It is ultimately ruptured at the apex by the expansion of the cap.
    • n velum In Isoëtes, the outgrown membranous margin of the fovea. Also called involucrum.
    • n velum In Mollusca, the highly characteristic ciliated formation of the embryo, which serves as an organ of locomotion in that stage when the embryo is called a veliger. It is usually soon lost, but in some cases is permanently retained in a modified form. See cuts under veliger.
    • n velum In Hydrozoa, a kind of flap or circular free edge which projects inward around the margin of the disk of many hydrozoans, as those which are bell-shaped or conical, and which from its presence are called craspedote; a velarium. The velum is present in all well-developed hydromedusans, but seldom in scyphomedusans, in which latter it is known as the pseudovelum. See cuts under Diphyidæ and medusiform.
    • n velum In Infusoria, a delicate veil-like membrane bordering the mouth in such forms as Cyclidium and Pleuronema.
    • n velum In sponges, one of the transverse diaphragms or partitions which constrict the lumen of an incurrent or excurrent canal.
    • n velum In Rotifera, the trochal disk. See cuts under trochal, Rotifer, and Rotifera.
    • n velum In entomology, a membrane attached to the inner side of the cubital spur in certain bees.
    • n velum In anatomy, a veil, or a part likened to a veil.
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Chambers's Twentieth Century Dictionary
    • n Velum vē′lum a velarium: the ciliated disc-like fold of the integument with which some embryo molluscs are provided
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Etymology

Webster's Revised Unabridged Dictionary
L., an awning, a veil. See Veil

Usage

In literature:

Vilon (equals Velum, a curtain).
"The Worlds Greatest Books, Volume XIII." by Various
Et obscuratus est sol: et velum templi seissum est medium.
"Notes and Queries, No. 28. Saturday, May 11, 1850" by Various
The position of this mouth is at the velum.
"Text Book of Biology, Part 1: Vertebrata" by H. G. Wells
Velum: a membranous appendage of the spurs at the apex of anterior tibia in bees a broad process at inner end of fore tibia.
"Explanation of Terms Used in Entomology" by John. B. Smith
V. Velum palati in section.
"Surgical Anatomy" by Joseph Maclise
In boisterous weather, as we learn from Martial and other authors, these difficulties were so great that the velum could not be spread.
"Museum of Antiquity" by L. W. Yaggy
The shell is developed on the dorsal surface behind the velum, the foot on the opposite or ventral surface behind the mouth.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6" by Various
There is a veliger stage in development, but the velum is reduced.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5" by Various
This larva is adapted for swimming, which is accomplished by means of the velum.
"Stories of the Universe: Animal Life" by B. Lindsay
In Hydromedusae the central nervous system forms two concentric nerve-rings at the margin of the umbrella, near the base of the velum.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 2" by Various
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In news:

This is one of Stephen Bickford's pencil-on-velum sketches for ELO's tour.
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