rod

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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 ?
As will be seen, the construction of tangents using this method is simple even in comparison to the construction of tangents using a straightedge and a compass.
There are three types of geometric constructions, based on the tools that are used to construct them: compass-and-straightedge (with or without relating to unit values), compass only, and straightedge only.
Using an engineer's scale instrument to measure and a triangle as a straightedge, draw a line 30 feet long to the scale of 1" = 10'.
Sellouts receive a lot of harsh treatment on these websites, but there are some exceptions, where people express a more compassionate stance: "If your straightedge friend wears X's one day then starts drinking the next don't beat him/her up because that is when they need you the most." (63) Or for someone outside of straight edge: "If you know someone who drinks, smokes or is an addict then help them, don't make things tougher on them." (64)
He showed that only polygons of certain numbers of sides could be constructed with compass and straightedge alone.
Bull float; To smooth and level horizontal surfaces, eliminating any high or low spots or ridges left by the straightedge.
Tatlin's face is featureless, but there is a compass protruding from his right eveysocket, his head is framed by a circular arc suspiciously like a halo and he holds a straightedge with the authority of Prospero displaying his staff.
were amazing, but we definitely drank at those shows even though the band was straightedge."
He covers measuring line segments, measuring angles, the triangle inequality, congruent figures, triangle congruence tests, Isosceles triangles, straightedge and compass constructions, right triangles, parallelograms, and a wide variety of other related subject matter over the course of his thirty-three chapters.
Before you begin tiling, check the surface with a straightedge. If you find a dip in a wall, flatten it by screeding a layer of setting-type joint compound over it as shown here.
Although I'm 44 years old now, no longer youthful or straightedge, I still hold those times in high regard and it was a real highlight of my life.