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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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? Mentioned in ? References in classic literature
 
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.
Grandfather's Chair by Hawthorne, Nathaniel View in context
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.
The Yellow Fairy Book by Lang, Andrew View in context
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.
The Original Peter Rabbit Books by Potter, Beatrix View in context
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