Skip to main content
Select Source:

rod

rod / räd/ • n. 1. a thin straight bar, esp. of wood or metal. ∎  a wand or staff as a symbol of office, authority, or power. ∎  a slender straight stick or shoot growing on or cut from a tree or bush. ∎  a stick used for caning or flogging. ∎  (the rod) the use of such a stick as punishment: if you'd been my daughter, you'd have felt the rod. ∎ vulgar slang a penis. 2. a fishing rod. 3. hist. a linear measure, esp. for land, equal to 51/2 yards (approx. 5.029 m). ∎  (also square rod) a square measure, esp. for land, equal to 160th of an acre or 301/4 square yards (approx. 25.29 sq m). 4. inf. a pistol or revolver. 5. Anat. a light-sensitive cell of one of the two types present in large numbers in the retina of the eye, responsible mainly for monochrome vision in poor light. Compare with cone (sense 3). PHRASES: ride the rods steal rides on freight trains: hundreds of young men took to riding the rods in search of employment. rule someone or something with a rod of iron control or govern someone or something very strictly or harshly.DERIVATIVES: rod·less adj. rod·let / -lət/ n. rod·like / -ˌlīk/ adj.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"rod." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 19 Aug. 2017 <http://www.encyclopedia.com>.

"rod." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 19, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/rod-1

"rod." The Oxford Pocket Dictionary of Current English. . Retrieved August 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/rod-1

rod

rod In the retina of the vertebrate eye, the more common of the two types of light receptor (compare CONE), which is sensitive to very low levels of stimulation. Many rods (in humans about 150) are connected by bipolar cells to a single ganglion cell whose axon is a nerve fibre in the optic tract; stimuli to the rods are summated (i.e. added together) to produce a total stimulus that must exceed a threshold before an impulse is discharged by the ganglion cell. Because the contribution of many individual rods is summated to produce a single impulse the resulting perceived image is not clearly defined. There are estimated to be about 65 × 106 rods in a single human retina and the eyes of some animals (e.g. opossums) have retinas containing only rods and no cones.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"rod." A Dictionary of Zoology. . Encyclopedia.com. 19 Aug. 2017 <http://www.encyclopedia.com>.

"rod." A Dictionary of Zoology. . Encyclopedia.com. (August 19, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/rod

"rod." A Dictionary of Zoology. . Retrieved August 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/rod

rod

rod a thin straight bar, especially of wood or metal. In former British usage, a rod was a unit of measurement, the equivalent of a perch.
make a rod for one's own back do something likely to cause difficulties for oneself later.
rule with a rod of iron control or govern very strictly or harshly.
spare the rod and spoil the child if children are not physically punished when they do wrong their personal development will suffer. It is proverbial, from the early 11th century, and often with biblical allusion to Proverbs 13:24.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"rod." The Oxford Dictionary of Phrase and Fable. . Encyclopedia.com. 19 Aug. 2017 <http://www.encyclopedia.com>.

"rod." The Oxford Dictionary of Phrase and Fable. . Encyclopedia.com. (August 19, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/rod

"rod." The Oxford Dictionary of Phrase and Fable. . Retrieved August 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/rod

rod

rod (rod) n. one of the two types of light-sensitive cells in the retina of the eye (compare cone). Rods are necessary for seeing in dim light. They contain the pigment rhodopsin, which is bleached in the light and regenerated in the dark. When all the pigment is bleached (i.e. in bright light) the rods no longer function. See also dark adaptation, light adaptation.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"rod." A Dictionary of Nursing. . Encyclopedia.com. 19 Aug. 2017 <http://www.encyclopedia.com>.

"rod." A Dictionary of Nursing. . Encyclopedia.com. (August 19, 2017). http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/rod

"rod." A Dictionary of Nursing. . Retrieved August 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/rod

rod

rod A type of light-sensitive receptor cell present in the retinas of vertebrates. Rods contain the pigment rhodopsin and are essential for vision in dim light. They are not evenly distributed on the retina, being absent in the fovea and occupying all of the retinal margin. See also dark adaptation. Compare cone.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"rod." A Dictionary of Biology. . Encyclopedia.com. 19 Aug. 2017 <http://www.encyclopedia.com>.

"rod." A Dictionary of Biology. . Encyclopedia.com. (August 19, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/rod-0

"rod." A Dictionary of Biology. . Retrieved August 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/rod-0

rod

rod straight slender wand XII; stick for measuring with; measure of length and of area XV. Late OE. rodd, synon. with Continental forms cited S.V. ROOD, but formally distinct; prob. rel. to ON. rudda club.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"rod." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 19 Aug. 2017 <http://www.encyclopedia.com>.

"rod." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (August 19, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/rod-3

"rod." The Concise Oxford Dictionary of English Etymology. . Retrieved August 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/rod-3

rod

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"rod." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 19 Aug. 2017 <http://www.encyclopedia.com>.

"rod." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (August 19, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/rod

"rod." The Columbia Encyclopedia, 6th ed.. . Retrieved August 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/rod

rod

rodbod, clod, cod, god, hod, mod, nod, od, odd, plod, pod, prod, quad, quod, rod, scrod, shod, sod, squad, tod, Todd, trod, wad •demigod • amphipod • unipod •tripod • isopod • myriapod • decapod •cephalopod • monopod • macropod •gastropod • arthropod • sauropod •ramrod • Nimrod • hotrod • pushrod •goldenrod • Novgorod • slipshod •roughshod • eisteddfod • tightwad

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"rod." Oxford Dictionary of Rhymes. . Encyclopedia.com. 19 Aug. 2017 <http://www.encyclopedia.com>.

"rod." Oxford Dictionary of Rhymes. . Encyclopedia.com. (August 19, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/rod-0

"rod." Oxford Dictionary of Rhymes. . Retrieved August 19, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/rod-0