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Possible definitions for xysts
cyst
Enclosed sac within body tissues. It has a distinct membrane and generally contains liquid. Most cysts are benign, but several kinds may be malignant or precancerous. Benign cysts often press on nearby organs and require removal. Formed by overproduction of epithelium (surface tissue of anatomical structures), cysts may become detached from surrounding structures and move freely. They can contain natural secretions, abnormal breakdown products, or, in infections, bacteria, larval parasites, and microbial products. Some organs, incl. the kidney, liver, and breast, can become filled with cysts as a result of cystic diseases that may be dangerous or may hide more serious diseases. See also tumor.
oyster
Any bivalve of two families, Ostreidae (true oysters) or Aviculidae (pearl oysters), found in temperate and warm coastal waters worldwide. Both valves (halves) have a rough, often dirty-gray outer surface and a smooth white lining (nacre). The lower valve, which affixes to a surface, is flattish. The smaller upper valve is convex and has rougher edges. The oyster filters its food, minute organic particles, from the water. Oysters are cultivated as a food, which is regarded as a delicacy. Pearls are the accumulation of nacre around a piece of foreign matter.
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