The Collaborative International Dictionary of English v.0.48:

Vail \Vail\, v. t. [Aphetic form of avale. See Avale, Vale.]
   [Written also vale, and veil.]
   1. To let fall; to allow or cause to sink. [Obs.]
      [1913 Webster]

            Vail your regard
            Upon a wronged, I would fain have said, a maid!
                                                  --Shak.
      [1913 Webster]

   2. To lower, or take off, in token of inferiority, reverence,
      submission, or the like.
      [1913 Webster]

            France must vail her lofty-plumed crest! --Shak.
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            Without vailing his bonnet or testifying any
            reverence for the alleged sanctity of the relic.
                                                  --Sir. W.
                                                  Scott.
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The Collaborative International Dictionary of English v.0.48:

Vail \Vail\ (v[=a]l), v. i.
   To yield or recede; to give place; to show respect by
   yielding, uncovering, or the like. [Written also vale, and
   veil.] [Obs.]
   [1913 Webster]

         Thy convenience must vail to thy neighbor's necessity.
                                                  --South.
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The Collaborative International Dictionary of English v.0.48:

Veil \Veil\, v. t. [imp. & p. p. Veiled; p. pr. & vb. n.
   Veiling.] [Cf. OF. veler, F. voiler, L. velarc. See Veil,
   n.] [Written also vail.]
   [1913 Webster]
   1. To throw a veil over; to cover with a veil.
      [1913 Webster]

            Her face was veiled; yet to my fancied sight,
            Love, sweetness, goodness, in her person shined.
                                                  --Milton.
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   2. Fig.: To invest; to cover; to hide; to conceal.
      [1913 Webster]

            To keep your great pretenses veiled.  --Shak.
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The Collaborative International Dictionary of English v.0.48:

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.]
   [1913 Webster]
   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.
      [1913 Webster]

            The veil of the temple was rent in twain. --Matt.
                                                  xxvii. 51.
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            She, as a veil down to the slender waist,
            Her unadorn['e]d golden tresses wore. --Milton.
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   2. A cover; a disguise; a mask; a pretense.
      [1913 Webster]

            [I will] pluck the borrowed veil of modesty from the
            so seeming Mistress Page.             --Shak.
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   3. (Bot.)
      (a) The calyptra of mosses.
      (b) A membrane connecting the margin of the pileus of a
          mushroom with the stalk; -- called also velum.
          [1913 Webster]

   4. (Eccl.) A covering for a person or thing; as, a nun's
      veil; a paten veil; an altar veil.
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   5. (Zool.) Same as Velum, 3.
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   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.
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The Collaborative International Dictionary of English v.0.48:

Caul \Caul\ (k[add]l), n. [OE. calle, kelle, prob. fr. F. cale;
   cf. Ir. calla a veil.]
   1. A covering of network for the head, worn by women; also, a
      net. --Spenser.
      [1913 Webster]

   2. (Anat.) The fold of membrane loaded with fat, which covers
      more or less of the intestines in mammals; the great
      omentum. See Omentum.
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            The caul serves for the warming of the lower belly.
                                                  --Ray.
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   3. A part of the amnion, one of the membranes enveloping the
      fetus, which sometimes is round the head of a child at its
      birth; -- called also a veil.
      [1913 Webster +PJC]

            It is deemed lucky to be with a caul or membrane
            over the face. This caul is esteemed an infallible
            preservative against drowning . . . According to
            Chrysostom, the midwives frequently sold it for
            magic uses.                           --Grose.
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            I was born with a caul, which was advertised for
            sale, in the newspapers, at the low price of fifteen
            guineas.                              --Dickens.
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WordNet (r) 3.0 (2006):

veil
    n 1: a garment that covers the head and face [syn: head
         covering, veil]
    2: a membranous covering attached to the immature fruiting body
       of certain mushrooms [syn: veil, velum]
    3: the inner membrane of embryos in higher vertebrates
       (especially when covering the head at birth) [syn: caul,
       veil, embryonic membrane]
    4: a vestment worn by a priest at High Mass in the Roman
       Catholic Church; a silk shawl [syn: humeral veil, veil]
    v 1: to obscure, or conceal with or as if with a veil; "women in
         Afghanistan veil their faces" [ant: unveil]
    2: make undecipherable or imperceptible by obscuring or
       concealing; "a hidden message"; "a veiled threat" [syn:
       obscure, blot out, obliterate, veil, hide]

Moby Thesaurus II by Grady Ward, 1.0:

160 Moby Thesaurus words for "veil":
   alibi, apology, apply to, awning, bamboo curtain,
   barrier of secrecy, beach umbrella, becloud, befog, blackout,
   blanket, blind, block, bosom, camouflage, canopy, censorship,
   classify, cloak, clothe, cloud, coat, color, coloring, conceal,
   cope, cover, cover story, cover up, cover-up, coverage, covering,
   covert, coverture, cowl, cowling, curtain, device, disguise,
   dissemble, distract attention from, drape, drapery,
   draw the curtains, eclipse, enclose, ensconce, enshroud, envelop,
   enwrap, excuse, facade, false front, feint, file and forget, film,
   front, gloss, gloss over, guise, handle, hanging, hide,
   hold out on, hood, housing, hush-up, in petto, invest,
   iron curtain, ironbound security, keep, keep back, keep between us,
   keep buttoned up, keep close, keep dark, keep from,
   keep in ignorance, keep mum, keep secret, keep snug,
   keep under cover, keep under wraps, lame excuse, lay on, lay over,
   light shield, locus standi, make no sign, mantilla, mantle, mask,
   muffle, never let on, not give away, not tell, oath of secrecy,
   obduce, obfuscate, obscure, occult, official secrecy,
   ostensible motive, overlay, overshadow, overspread, pall, parasol,
   play dumb, poor excuse, pretense, pretension, pretext,
   protestation, public motive, put on, put-off, refuge, repression,
   screen, scum, seal of secrecy, secrete, security, semblance, shade,
   shader, shadow, sham, shelter, shield, show, shroud, shutter,
   slur over, smoke screen, smothering, spread over, stalking-horse,
   stifling, stratagem, subterfuge, sunblind, sunshade, superimpose,
   superpose, suppression, trick, umbrella, varnish, veil of secrecy,
   veiler, veiling, vestment, whitewash, withhold, wrap, wraps,
   yashmak



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

VEIL
       Video Encoded Invisible Light Technology (VEIL)