A circular, plate-like organ or body, especially the papilla of the eye, the entrance of the optic nerve into the eyeball. Its area corresponds with that of the blind spot. In dentistry, an instrument in the form of a disc, made of emery, cuttle-fish, bone, or sand-paper, for finishing fillings on surfaces between teeth. D., Blood. See Blood-corpuscle. D.-carrier, an instrument applied to the dental engine for the better application of corundum discs to the teeth. D., Choked. See Papillitis. D., Corundum. A device used in dentistry for separating teeth, by cutting away a portion; it is used with the dental engine, and applied by means of carriers, that admit of ready adjustment and change of the disc to any desired angle with the shaft containing it. D., Cupping of. See Excavation of the Optic Nerve. D., Germinal, the small disc of the blastodermic membrane, in which the first traces of the embryo are seen. D., Hypermetropic, hazy; simulating optic neuritis, observed in hypenne- tropia. D., Proligerous. See Discus proligerus.
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