blind spot

  1. the small area, insensitive to light, in the retina of the eye where the optic nerve enters
  2. an area where vision is hindered or obscured
  3. a prejudice, or area of ignorance, that one has but is often unaware of
  4. an area where radio reception is poor

See blind spot in American Heritage Dictionary 4

noun
  1. 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.
  2. A part of an area that cannot be directly observed under existing circumstances.
  3. An area where radio reception is weak or nonexistent.
  4. 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 tense” (Mordecai Richler).

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