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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).
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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]
Farlex Partner Medical Dictionary © Farlex 2012

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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

rod

Orthopedics A metal fixation device used to stabilize fractures. See Harrington rod.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

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]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Rod

Photoreceptor that is highly sensitive to low levels of light and transmits images in shades of gray.
Mentioned in: Color Blindness
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

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]
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Each servo-pneumatic axis consists of: rodless pneumatic cylinder type DGPIL-25-600 (Festo) with integral feedback transducer (built-in Temposomc encoders for continual positioning feedback to the master control unit), 5/3 servopneumatic valve (directional proportional control valve) type MPYE-5-1/8-HF-010B (Festo), axis interface type SPC-AIF, positioning axis sub-controller type SPC-200 (the use of a sub-controller card permits control of up to four axes) and Ethernet/Can Bus interface (Festo).
Moreover, where cam followers, wheels, tracks, rails and other mechanical components subject to wear and degradation have previously been used for these motion functions, the HLM's sealed linear motion slides and rodless cylinders replace these older components to provide smoother, quieter and more energy-efficient operation.
Some years ago, Tol-O-Matic developed a system called PrecisionAire, which used a magnetic particle brake to help control the motion of a rodless cylinder.
Although there are various methods of achieving high speed linear motion, including motor driven rack and pinion and belt drive systems or rodless pneumatic cylinders, one of the most efficient and flexible mechanisms for high speed assembly of small parts is the linear motion (LM) guide and ballscrew drives.
The Ultran slide, which provides high load carrying capabilities within an Ultran rodless cylinder, is now available in a 1 1/16 16-in.
Cases are fed into and out of the elevator by rodless cylinder pushers.
* The new HLM series from Hunter Foundry Machinery Corp., Schaumburg, Ill., combines and integrates magnetically coupled rodless cylinders and linear bearings for movements of the squeeze platen, cope flask, sand measuring hopper and other components.
HOERBIGER ORIGA has extended its Origa System Plus (OSP-P) programme of rodless cylinders with a new guidance component designed to withstand the heaviest loads.
Engineers at the two companies made the decision to use Norgren's V22 Fieldbus II pneumatic valve systems and Lintra rodless cylinders.
Rodless actuators guide and support the load with a carriage which moves along the actuator body.
The team at Permex have been successful in developing an adjustable pneumatic 'stepping' mechanism for use with the rodless cylinder which lifts the filling lance.