cone

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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 ?
An American teacher told how she felt forced to use a traffic cone to secure a spot because so many of her co-workers were giving their underground car parking passes to friends.
They gave all three of us Class "C" misdemeanors for theft, although the citation didn't mention it was for stealing traffic cones.
Meldrum, from Bellshill, North Lanarkshire, admitted to culpably and recklessly and with utter disregard for the occupants, throwing the traffic cone through the window of the property in Wallace Crescent, Plean, in September last year.
(https://www.theguardian.com/uk-news/2017/sep/26/man-who-thought-he-had-lung-cancer-finds-lump-was-a-toy-traffic-cone) The Guardian stated that during a bronchoscopy the doctors were shocked to discover the tumor was actually a tiny toy traffic cone the patient had received as part of a gift when he turned 7 years old.
The quick-thinking officer pushed over the raiders' getaway bike before arming himself with a traffic cone and taking on the thugs.
Suddenly she felt a blow to the back of the head which knocked her to the ground and when she came round she saw the defendant stood over her with a traffic cone. He hit her twice more before police arrived and he was arrested."
Councillor John Wynn Jones at Llys Dewi Sant, Bangor, where retired residents have been plagued by teenagers throwing traffic cones, daubing graffiti and smearing excrement on doors
Kirklees Highways removed the bollards and centre pole and covered up the holes with a traffic cone weighed down by a sandbag.
Three arrests were made after the scrap during which a policeman suffered facial injuries when hit by a flying traffic cone.
But the argument continued outside and O'Malley got out of his car to shout at Mr Maxfield who had picked up a traffic cone.
The sight of the statue, complete with traffic cone on its head, has become a fun feature of the city.
The former Ospreys boss has held team meetings in the toilet and spent one with a traffic cone on his head.

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