cone
US /koʊn/
UK /koʊn/

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a light-sensitive cell in the retina of the eye, which provides sharp vision and color discrimination
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The human eye has millions of cones that detect color.
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Defects in cones can lead to color blindness.
1.
to make something into the shape of a cone
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She coned the paper to make a party hat.
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The engineers coned the metal sheet for the rocket nose.