| druse | <chemical> A cavity in a rock, having its interior surface studded with crystals and sometimes filled with water; a geode. Origin: Cf. G. Druse bonny, crystallized piece of ore, Bohem. Druza. Cf. Dross. Source: Websters Dictionary (01 Mar 1998) |
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| drused | <chemical> Covered with a large number of minute crystals. Source: Websters Dictionary (01 Mar 1998) |
| drusen | Small bright structures seen in the retina and in the optic disc. Origin: Ger. Pl. Of druse, stony nodule, geode (05 Mar 2000) |
| drusen of the macula | Excrescences of Bruch's membrane that produce a window in the retinal pigment epithelium and are a feature of age-related macular retinal degeneration. Synonym: macular drusen. (05 Mar 2000) |
| drusen of the optic nerve head | Basophilic, laminated, calcareous acellular masses that resemble crystals within the nerve head, anterior to the lamina cribrosa, that may simulate papilledema and/or cause visual field defects. Synonym: intrapapillary drusen. (05 Mar 2000) |