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 ?
As introduced in Section 2, when the transmitter and receiver fly on the required conical surfaces, (cos[[OMEGA].sub.T] sin [[psi].sub.T]) and (cos[[OMEGA].sub.R] sin [[psi].sub.R]) are guaranteed as both constants, so as to [absolute value of [g.sub.R]].
The two side programs are more specific: ST_2 evaluates the power collected by the heliostats field; ST_3, using a polar conical surface (a CPC) as secondary optics, selects the CPC aperture.
Nanocones are often called one pentagonal nanocones, and word pentagonal used for pentagon as its core and like other families of nanocones there are hexagonal layers on its conical surface (Fig.
Based on geometry analysis, if sensor moves in conical surface with symmetry axis overlapping with the projection of LOS direction on XOY ground plane, interpolation can be avoided.
The obtained insert shape required additionally the spark machining of three recesses on the conical surface, to be made after heat treatment by hardening.
STEP Entity, Cartesian Point, Line, Circle, Ellipse, Parabola, Hyperbola, PolyLine, Composite Curve, Trimmed Curve, Bspline Curve, Plane, Cylindrical Surface, Conical Surface, Spherical Surface, Toroidal Surface, Surface of Linear Extrusion, Surface of Revolution, B-spline Surface, Rectangular Trimmed Surface, Curve Bounded Surface, Offset Surface, Manifold Solid Brep, Shell Based Surface Model.
Recommended are brass pliers to grip and pull material; brass scrapers in different widths for cleaning flat exposed surfaces; brass bristle tube brushes in diameters from 1/16 to 1 inch, in 1/16-inch increments, for cleaning holes and recesses; brass rods in different diameters for pushing material out flow holes; copper gauze for cleaning and polishing exposed round or conical surfaces; copper knives for removing residue from recesses and other hard-to-reach areas; polishing compound to restore polished surfaces; compressed air, which is more effective for releasing plastic but also aids in silicone removal; purging compound to purge the extruder screw and barrel of residual polymer; cleaning solutions; and cleaning oven for plastic, not silicone.