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rod

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rod

Type of light-sensitive cell in the retina of most vertebrates. Rods are highly sensitive and provide only black and white vision. They are used when lighting conditions are poor and are the only type of visual cell found in animals active at night. Colour vision requires a separate set of cells known as cones.



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For such offenders, if any such there be, a rod of birch is hanging over the fireplace, and a heavy ferule lies on the master's desk.
Then the Crab gave her a golden rod, and said, 'Go and strike with this rod three times upon the ground on the place which the King showed you, and to-morrow morning the wall will be there.
JEREMY put on a macintosh, and a pair of shiny goloshes; he took his rod and basket, and set off with enormous hops to the place where he kept his boat.
 
 
 
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