The Collaborative International Dictionary of English v.0.48:

Naked \Na"ked\ (n[=a]"k[e^]d), a. [AS. nacod; akin to D. naakt,
   G. nackt, OHG. nacchot, nahhot, Icel. n["o]kvi[eth]r, nakinn,
   Sw. naken, Dan. n["o]gen, Goth. naqa[thorn]s, Lith. n[*u]gas,
   Russ. nagii, L. nudus, Skr. nagna. [root]266. Cf. Nude.]
   [1913 Webster]
   1. Having no clothes on; uncovered; nude; bare; as, a naked
      body; a naked limb; a naked sword.
      [1913 Webster]

   2. Having no means of defense or protection; open; unarmed;
      defenseless; as, naked to invasion.
      [1913 Webster]

            Had I but served my God with half the zeal
            I served my king, he would not in mine age
            Have left me naked to mine enemies.   --King Henry
                                                  VIII., Act
                                                  iii. sc. 2
                                                  (Shakespeare)
      [PJC]

            Thy power is full naked.              --Chaucer.
      [1913 Webster]

            Behold my bosom naked to your swords. --Addison.
      [1913 Webster]

   3. Unprovided with needful or desirable accessories, means of
      sustenance, etc.; destitute; unaided; bare.
      [1913 Webster]

            Patriots who had exposed themselves for the public,
            and whom they saw now left naked.     --Milton.
      [1913 Webster]

   4. Without addition, exaggeration, or excuses; not concealed
      or disguised; open to view; manifest; plain.
      [1913 Webster]

            The truth appears so naked on my side, That any
            purblind eye may find it out.         --Shak.
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            All things are naked and opened unto the eyes of him
            with whom we have to do.              --Heb. iv. 13.
      [1913 Webster]

   5. Mere; simple; plain; as, the naked truth.
      [1913 Webster]

            The very naked name of love.          --Shak.
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   6. (Bot.) Without pubescence; as, a naked leaf or stem; bare,
      or not covered by the customary parts, as a flower without
      a perianth, a stem without leaves, seeds without a
      pericarp, buds without bud scales.
      [1913 Webster]

   7. (Mus.) Not having the full complement of tones; -- said of
      a chord of only two tones, which requires a third tone to
      be sounded with them to make the combination pleasing to
      the ear; as, a naked fourth or fifth.
      [1913 Webster]

   Naked bed, a bed the occupant of which is naked, no night
      linen being worn in ancient times. --Shak.

   Naked eye, the eye alone, unaided by eyeglasses, or by
      telescope, microscope, or other magnifying device.

   Naked-eyed medusa. (Zool.) See Hydromedusa.

   Naked flooring (Carp.), the timberwork which supports a
      floor. --Gwilt.

   Naked mollusk (Zool.), a nudibranch.

   Naked wood (Bot.), a large rhamnaceous tree (Colibrina
      reclinata) of Southern Florida and the West Indies,
      having a hard and heavy heartwood, which takes a fine
      polish. --C. S. Sargent.
      [1913 Webster]

   Syn: Nude; bare; denuded; uncovered; unclothed; exposed;
        unarmed; plain; defenseless.
        [1913 Webster]

WordNet (r) 3.0 (2006):

naked eye
    n 1: the eye unaided by any optical instrument that alters the
         power of vision or alters the apparent size or distance of
         objects; "it is not safe to look directly at the sun with
         the naked eye"

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "naked eye":
   baby blues, banjo eyes, bright eyes, clear eyes, command, cornea,
   domination, eye, eyeball, eyelid, eyereach, eyeshot, eyesight,
   field of view, field of vision, goggle eyes, horizon, iris, ken,
   lens, lid, limit of vision, line of sight, nictitating membrane,
   oculus, optic, optic nerve, orb, organ of vision, outlook,
   outlook over, peeper, perspective, popeyes, prospect, pupil, range,
   retina, saucer eyes, scan, sclera, scope, scope of vision, sight,
   sightliness, starry orbs, survey, unaided eye, view, vista,
   visual organ