from The American HeritageĀ® Dictionary of the English Language, 4th Edition

  • n. Anatomy The small, circular, optically insensitive region in the retina where fibers of the optic nerve emerge from the eyeball. It has no rods or cones. Also called optic disk.
  • n. A part of an area that cannot be directly observed under existing circumstances.
  • n. An area where radio reception is weak or nonexistent.
  • n. A subject about which one is markedly ignorant or prejudiced: "Of course, all of us . . . have our crotchets and our blind spots. I abhor novels written in the present tenseā€ ( Mordecai Richler).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The place where the optic nerve attaches to the retina, and so where the retina cannot detect light.
  • n. In driving, the part of the road that cannot be seen in the rear-view mirror.
  • n. An inability to recognize a fact or think clearly about a certain topic, especially because of a prejudice.
  • n. A location where radio reception and/or transmission is significantly poorer than in surrounding locations.

from the GNU version of the Collaborative International Dictionary of English

  • adj. the point in the retina of the eye where the optic nerve enters, and which is insensible to light.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the point where the optic nerve enters the retina; not sensitive to light
  • n. a subject about which you are ignorant or prejudiced and fail to exercise good judgment


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