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1 definition found
 for Rods and cones
From The Collaborative International Dictionary of English v.0.48 :

  Rod \Rod\, n. [The same word as rood. See Rood.]
     1. A straight and slender stick; a wand; hence, any slender
        bar, as of wood or metal (applied to various purposes).
        Specifically:
        (a) An instrument of punishment or correction;
            figuratively, chastisement.
            [1913 Webster]
  
                  He that spareth his rod hateth his son. --Prov.
                                                    xiii. 24.
            [1913 Webster]
        (b) A kind of sceptor, or badge of office; hence,
            figuratively, power; authority; tyranny; oppression.
            "The rod, and bird of peace." --Shak.
        (c) A support for a fishing line; a fish pole. --Gay.
        (d) (Mach. & Structure) A member used in tension, as for
            sustaining a suspended weight, or in tension and
            compression, as for transmitting reciprocating motion,
            etc.; a connecting bar.
        (e) An instrument for measuring.
            [1913 Webster]
  
     2. A measure of length containing sixteen and a half feet; --
        called also perch, and pole.
        [1913 Webster]
  
     Black rod. See in the Vocabulary.
  
     Rods and cones (Anat.), the elongated cells or elements of
        the sensory layer of the retina, some of which are
        cylindrical, others somewhat conical.
        [1913 Webster]

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