blind spot
noun
plural blind spots
1
a
: the small circular area at the back of the retina where the optic nerve enters the eyeball and which is devoid of rods and cones and is not sensitive to light
called also optic disc
see eye illustration
b
: a portion of a field that cannot be seen or inspected with available equipment
2
sometimes offensive
: an area in which someone fails to exercise judgment or discrimination see usage paragraph at blind entry 1
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Merriam-Webster unabridged




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