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 ?
Tesla Driver said that much to his surprise, Navigate on Autopilot was able to detect the traffic cones. It recognized the space between the cones, and saw the area as a lane instead of the actual painted lines on the road.
Traffic queuing on North Road caused by traffic cones left on Gabalfa flyover, left ROB NORMAN
Gwyneth Jones who lives in Llanfairfechan said: "Everybody is mightily sick of these constant roadworks, the traffic cones have become part of the road.
BANGKOK -- Thailand's political lexicon has a new term: the Holy Traffic Cone.
We use traffic cones and bunting and we have four blow-up punchbags.
Recently I counted 54 traffic cones between M45 island and the old Peugeot works at Ryton.
The Lit-Cones will render traffic cones highly visible, thereby lending an important safety-related benefit to motorists, schools, and construction personnel wherever it is used.
Drivers often give them little thought - they see a traffic cone and assume it must be something official and so they continue to circle, looking for somewhere to park.
And the no-nonsense former publican proved just that, when he personally removed 30 traffic cones which were causing gridlock in Dale Street.
Traffic cones will define the exit lane next to the construction area.
A MAN who took two traffic cones as a practical joke found himself in deep trouble with the law - so much so that they locked him up for four days.
Not only are participants competing for the best time, but drivers incur penalties for hitting the traffic cones around the course.

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