naked eye

Sight unassisted by an instrument such as a microscope or telescope. For example, These insects are too small to be seen with the naked eye. This expression was first recorded in 1664.

Words Nearby naked eye

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

How to use naked eye in a sentence

  • The naked eye can see at best in the part of the heavens visible from any one point not more than thirty thousand stars.

    Outlines of the Earth's History | Nathaniel Southgate Shaler
  • But all around these star-clouds, or Nebulae as they are called, the clear blue sky is discovered by the naked eye.

    Gospel Philosophy | J. H. Ward
  • In that year a parhelion appeared undistinguishable by the naked eye from the real sun.