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Rods and cones
(gcide) | 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.
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He that spareth his rod hateth his son. --Prov.
xiii. 24.
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(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.
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2. A measure of length containing sixteen and a half feet; --
called also perch, and pole.
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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.
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