cone


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Related to cone: Cone biopsy, Cone eye

cone

 [kōn]
1. a solid figure or body having a circular base and tapering to a point.
2. one of the conelike structures which, with the rods, form the light-sensitive elements of the retina; the cones make possible the perception of color. See also eye and vision. Called also retinal cone.
3. in radiology, a conical or open-ended cylindrical structure formerly used as an aid in centering the radiation beam and as a guide to source-to-film distance. Cones were commonly attached to the x-ray tube prior to the use of the collimator.
4. in root canal therapy, a solid substance with a tapered form, usually made of gutta-percha or silver, fashioned to conform to the shape of a root canal.
ether cone a cone-shaped device used over the face in administration of ether for anesthesia.
gutta-percha cone in root canal therapy, a plastic radiopaque cone made from gutta-percha and other ingredients, available in standard sizes according to the dimensions of root canal reamers and files; used to fill and seal the canal along with sealer cements. Called also gutta-percha point.
cone of light the triangular reflection of light seen on the tympanic membrane.
pressure cone the area of compression exerted by a mass in the brain, as in transtentorial herniation.
retinal cone cone (def. 2).
silver cone silver point.

cone

(kōn),
1. A surface joining a circle to a point above the plane containing the circle.
2. The photosensitive, outward-directed, conic process of a cone cell essential for sharp vision and color vision; cones are the only photoreceptors in the fovea centralis and become interspersed with increasing numbers of rods toward the periphery of the retina. Synonym(s): cone cell of retina
3. Metallic cylinder or truncated cone, either circular or square in cross-section, used to confine a beam of x-rays.
Synonym(s): conus (1)
[G. kōnos, cone]

cone

(kōn)
n.
Physiology One of the photoreceptors in the retina of the eye that is responsible for daylight and color vision. These photoreceptors are most densely concentrated in the fovea centralis, creating the area of greatest visual acuity. Also called cone cell.

cone

Gynecology Cone biopsy, see there Neurophysiology
1. A color receptor cell in the retina of the eye.
2. Growth cone, see there Urogynecology See Vaginal cone.

cone

(kōn)
1. A surface joining a circle to a point above the plane containing the circle.
2. The photosensitive, outward-directed, conical process of a cone cell essential for sharp vision and color vision; cones are the only photoreceptor in the fovea centralis and become interspersed with increasing numbers of rods toward the periphery of the retina.
3. Metallic cylinder or truncated cone, either circular or square in cross-section, used to confine a beam of x-rays.
Synonym(s): conus (1) .
[G. kōnos, cone]

cone

  1. (in plants) a reproductive structure in the form of a conical mass of scale-like sporophylls surrounding a central axis, found particularly in GYMNOSPERMS but also in other plant groups, e.g. horsetails (Equisetales).
  2. (in animals) a light-sensitive structure in the vertebrate eye. See CONE CELL.

cone

(kōn)
1. A surface joining a circle to a point above the plane containing the circle.
2. Metallic cylinder or truncated cone used to confine a beam of x-rays.
[G. kōnos, cone]
References in periodicals archive ?
"Amazingly, these 'Goldilocks' cones of 'just right' angles exactly match the shapes of eroded clay resulting from our experiments and actual conical meteorites," Ristroph added.
'Rey Nambatac played a great game, he's been playing great, he was like Michael Jordan out there today,' said Cone. 'He was everywhere today doing anything he wanted, took any shot he wanted.'
Even if eaten alone, Adlay Sweet Cone is more delicious compared to other commercially available cones in the market.
Cone Bakes are simple to prepare and easy to handle and Brakes will provide tools, including a free rack with the first case purchase, plus tips and recipe ideas.
A prophet to the American church, Cone constantly reminded white Christians that racism was a sin--and that the theology he helped develop during 1960s and beyond was a needed corrective, even if few whites paid attention or heeded his message.
Over Two Hundred Cones were served during these two events, compliments of the Bear Family Restaurants and Owner/Operator David Bear.
Hendrickson, "Spatial and temporal expression of cone opsins during monkey retinal development," The Journal of Comparative Neurology, vol.
Red and green cones each come in two types: One type signals "white" and another signals color, vision researcher Ramkumar Sabesan and colleagues at the University of California, Berkeley discovered.
In addition to BoDeans Baking Group, Joy Cone Co is simultaneously acquiring Altesa, the largest ice cream cone producer in Mexico.
Other sources bared that Cone will bring in Richard del Rosario as an assistant while Jason Webb will become the new Hotshots mentor, with Johnny Abarrientos serving as his chief lieutenant.
The King Cone Caramel Pecan, a combination of caramel and vanilla-flavoured ice cream also wrapped in an American Style wafer cone.