- A surface joining a circle to a point above the plane containing the circle.
- 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.
- Metallic cylinder or truncated cone, either circular or square in cross-section, used to confine a beam of x-rays.
Synonym(s): cone cell of retina
[G. konos, cone]
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