drusen

Noun

druse (plural druses or drusen)

1. A rock surface with a crust of tiny crystals.
   • Occurs as a fine coating over the minerals in druses or cavities in the granite.1889, Dana et al, A System of Mineralogy
2. An aggregation of calcium oxalate crystals found in certain plants.
3. A tiny yellow or white accumulation of extracellular material that builds up in Bruch's membrane of the eye.