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retinal cone

   Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
cone (kōn)
1. a solid figure or body having a circular base and tapering to a point.
3. in radiology, a conical or open-ended cylindrical structure used as an aid in centering the radiation beam and as a guide to source-to-film distance.
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.

cone of light  the triangular reflection of light seen on the tympanic membrane.
retinal cone  one of the specialized conical or flask-shaped outer segments of the visual cells, which, with the retinal rods, form the light-sensitive elements of the retina.
twin cones  retinal cone cells in which two cells are blended.

retinal cone
n.
See cone cell.


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