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The Collaborative International Dictionary
velum

Veil \Veil\ (v[=a]l), n. [OE. veile, OF. veile, F. voile, L. velum a sail, covering, curtain, veil, probably fr. vehere to bear, carry, and thus originally, that which bears the ship on. See Vehicle, and cf. Reveal.] [Written also vail.]

  1. Something hung up, or spread out, to intercept the view, and hide an object; a cover; a curtain; esp., a screen, usually of gauze, crape, or similar diaphnous material, to hide or protect the face.

    The veil of the temple was rent in twain.
    --Matt. xxvii. 51.

    She, as a veil down to the slender waist, Her unadorn['e]d golden tresses wore.
    --Milton.

  2. A cover; disguise; a mask; a pretense.

    [I will] pluck the borrowed veil of modesty from the so seeming Mistress Page.
    --Shak.

  3. (Bot.)

    1. The calyptra of mosses.

    2. A membrane connecting the margin of the pileus of a mushroom with the stalk; -- called also velum.

  4. (Eccl.) A covering for a person or thing; as, a nun's veil; a paten veil; an altar veil.

  5. (Zo["o]l.) Same as Velum, 3.

    To take the veil (Eccl.), to receive or be covered with, a veil, as a nun, in token of retirement from the world; to become a nun.

Douglas Harper's Etymology Dictionary
velum

"the soft palate," 1771, from Latin velum "a sail, awning, curtain, covering" (see veil (n.)).

Wiktionary
velum

n. 1 A thin membrane, resembling a veil, such as: 2 # (context anatomy English) The soft palate. 3 # (context botany English) A thin membrane partially covering the cluster of sporangium near the leaf base in quillworts and their extinct relatives. 4 # (context mycology English) A veil-like membrane of immature mushrooms extending from the margin of the cap to the stem and is torn by growth, to reveal the gills. 5 # (context malacology English) A locomotory and feeding organ provided with cilia found in the larval stage of bivalves. 6 # (context zoology English) A circular membrane round the cap of medusa. 7 # A delicate membrane found on certain protists. 8 (context meteorology English) An accessory cloud resembling a veil extending over a large distance. Normally associated with cumulus and cumulonimbus.

WordNet
velum
  1. n. membrane of the young sporophore of various mushrooms extending from the margin of the cap to the stem and is ruptured by growth; represented in mature mushroom by an annulus around the stem and sometimes a cortina on the margin of the cap [syn: partial veil]

  2. membrane initially completely investing the young sporophore of various mushrooms that is ruptured by growth; represented in the mature mushroom by a volva around lower part of stem and scales on upper surface of the cap [syn: universal veil]

  3. a muscular flap that closes off the nasopharynx during swallowing or speaking [syn: soft palate]

  4. [also: vela (pl)]

Wikipedia
Velum

Velum (Latin for veil, and often used for some kind of membrane in the biological sciences) may refer to:

Usage examples of "velum".

But as he swished his hand through the cloud to clear the water, Laquatas noticed that the black ink covering the map was liquefying from the heat and lifting off the velum, showing details underneath the inkblot.

Piles of papers and large velum ledgers were stacked neatly atop a large oak desk.

Professor Slocombe turned one velum page and then another and then he closed his tome and sat back in his padded leather chair and spoke.

Real tea for Kellen, who missed the taste, and a thick roll of velum, drawing charcoal, and a sponge.

Shalkan said, stepping daintily out of the woods, hidden until that moment, though how something the size of a pony and whiter than new velum could hide that easily, Kellen could never figure out.

From a pocket in her dress, Meriel withdrew a small velum envelope folded over a square of stiff pasteboard.

Still, he used a pencil to hold it in place, and another to lift the unsealed flap of the envelope and then to wriggle the single sheet of velum out onto the desk.

Lokath Carrel, Syrah Alanu, Vela Pernath and Princess Alena are carved into tombstones.

Vela tried to attract Syrah, the closest one to her other than Catrin, whom she detested vehemently.

Inoltre fabbricai una piccola vela di civada da collocare in alto, a imitazione della velatura che di norma viene montata sulle lance delle nostre navi, e come tornava comodo a me per la manovra.

In quella nuova, infatti, sebbene mi fossi fatto una tenda come nell'altra, utilizzando all'uopo un pezzo di vela, e l'avessi sistemata molto bene, non disponevo peraltro del riparo di una collina per proteggermi dalle tempeste, né una grotta nella quale rifugiarmi quando la pioggia fosse stata troppo violenta.

A questo punto conclusi che ormai era abbastanza carica, e cominciai a domandarmi come avrei potuto arrivare a terra con tanta roba, dal momento che non avevo remi, né vela, né timone e la minima bava di vento avrebbe compromesso la mia navigazione.

After the universal veil has been ruptured and the cap has commenced to expand, the secondary veil, or velum, may be seen as a firm, felted or interwoven membrane stretched between the upper part of the stem and the edge or margin of the cap.

He stopped to let the students check the positions of these three important stars, and identify their constellations: Navi in Cassiopeia, Dnoces at the far tip of Ursa Major, and Regor to the south in Vela.