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rod

 [rod]
1. a straight, slim mass of substance.
2. one of two types of visual cells, cylindrical segments that contain rhodopsin; together with the cones they form the light-sensitive elements of the retina. See also eye and vision. Called also retinal rod.
Corti's r's pillar cells.
Harrington rod a rigid contoured metal rod used in Harrington instrumentation.
olfactory rod the slender apical portion of an olfactory bipolar neuron, a modified dendrite extending to the surface of the epithelium.
retinal rod rod (def. 2).

rod

(rod),
1. A slender cylindric structure or device.
2. The photosensitive, outward-directed process of a rhodopsin-containing rod cell in the external granular layer of the retina; many millions of such rods, together with the cones, form the photoreceptive layer of rods and cones. Synonym(s): rod cell of retina
[A.S. rōd]

rod

(rŏd)
n.
1. Anatomy Any of various rod-shaped cells in the retina that respond to dim light. Also called rod cell.
2. Microbiology An elongated bacterium; a bacillus.

rod

Orthopedics A metal fixation device used to stabilize fractures. See Harrington rod.

rod

(rod)
1. A straight, slender, cylindric structure or device. For surgical rods, see nail;pin
2. The photosensitive, outward-directed process of a rhodopsin-containing rod cell in the external granular layer of the retina; many millions of such rods, together with the cones, form the photoreceptive layer of rods and cones.
Synonym(s): rod cell.
[A.S. rōd]

rod

or

rod cell

a rod-shaped, light-sensitive cell lying in the more peripheral parts of the RETINA in the vertebrate eye. Rods are particularly associated with vision under conditions of low illumination and they occur in large numbers in nocturnal animals. They are not capable of colour discrimination and their visual acuity is poor (compare CONE CELL). RHODOPSIN (visual purple) is found in rods. There are some 240 million rods in the retinas of a primate.see RETINAL CONVERGENCE.

Rod

Photoreceptor that is highly sensitive to low levels of light and transmits images in shades of gray.
Mentioned in: Color Blindness

rod

(rod)
1. A straight, slender, cylindric structure or device.
2. The photosensitive, outward-directed process of a rhodopsin-containing rod cell in the external granular layer of the retina.
[A.S. rōd]
References in periodicals archive ?
And Mr Roden has something of a blank sheet in front of him in terms of shaping the new school, which will be a free non-selective state school in a purpose-built building on the university's Selly Oak site.
When Roden, who now lives in Coventry, was released from prison in 1993 after serving six months, he took the memoirs with him.
According to Roden, similar reactions had previously been described with dissolved organic compounds, but insoluble ones likely play a larger role in natural environments.
Roden's halfback partner James Coyle is a nuclear engineer, Ian Hodson a plumber and Richard Mervill is a youth worker.
The concert will feature Dutch music by the Roden Choir, English by the Cathedral Choir and they will sing together a number of well-known English choral pieces including Parry's I Was Glad, Sumsion's They That Go Down To The Sea In Ships and Handel's Zadok The Priest.
Roden and Attwooll were convicted of the murders of Attwooll's business partner Gerry Stevens, 42, and his 37-year-old lover, taxi receptionist Christine Rees.
Such has been the volume of testing the team has completed over the years at Knockhill that Roden laughed when asked to quantify the number of laps his team has completed.
John Roden's family is now offering pounds 2,000 to anybody who comes forward with essential new evidence.
With: Lenka Vlasakova, Karel Roden, Jitka Schneiderova, Gabina Skrabakova, Marek Daniel, Petra Ernyeiova.
"Bergen Brunswig's fourth quarter and fiscal year results validate strength of our drug and specialty distribution businesses," comments president and chief executive officer Donald Roden. "Again we have exceeded consensus earnings-per-share estimates - this time by two cents.
He is stuck in some sort of fake train station, but he communicated with the pack through radios to tell them to "find Canaan." Now that they know Stiles is real, Scott (Tyler Posey), Lydia (Holland Roden) and Malia (Shelley Hennig) will be doing everything they can to bring their friend back.
Headteacher Michael Roden said demand for places at the PS23 million University of Birmingham School had been "phenomenal".