Medical Definition of cone
1: a solid having a circular base and sides that slope evenly to a point
2a: any of the conical photosensitive receptor cells of the vertebrate retina that function in color vision—compare rodb: any of a family (Conidae) of numerous somewhat conical tropical gastropod mollusks that include a few highly poisonous forms—see conus
3: a cusp of a tooth especially in the upper jaw
Seen and Heard
What made you want to look up cone? Please tell us where you read or heard it (including the quote, if possible).