naked eye
 肉眼


 Na·ked a.
 1. Having no clothes on; uncovered; nude; bare; as, a naked body; a naked limb; a naked sword.
 2. Having no means of defense or protection; open; unarmed; defenseless; as, naked to invasion.
    Thy power is full naked.   --Chaucer.
    Behold my bosom naked to your swords.   --Addison.
 3. Unprovided with needful or desirable accessories, means of sustenance, etc.; destitute; unaided; bare.
    Patriots who had exposed themselves for the public, and whom they saw now left naked.   --Milton.
 4. Without addition, exaggeration, or excuses; not concealed or disguised; open to view; manifest; plain.
    The truth appears so naked on my side,                   That any purblind eye may find it out.   --Shak.
    All things are naked and opened unto the eyes of him with whom we have to do.   --Heb. iv. 13.
 5. Mere; simple; plain; as, the naked truth.
    The very naked name of love.   --Shak.
 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.
 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.
 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.
 Syn: -- Nude; bare; denuded; uncovered; unclothed; exposed; unarmed; plain; defenseless.

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 Mi·cro·scope n.  An optical instrument, consisting of a lens, or combination of lenses, for making an enlarged image of an object which is too minute to be viewed by the naked eye.
 Compound microscope, an instrument consisting of a combination of lenses such that the image formed by the lens or set of lenses nearest the object (called the objective) is magnified by another lens called the ocular or eyepiece.
 Oxyhydrogen microscope, and Solar microscope. See under Oxyhydrogen, and Solar.
 Simple microscope, or Single microscope, a single convex lens used to magnify objects placed in its focus.

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 naked eye
      n : 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"