cyst
cyst (sist) n.
1. an abnormal sac or closed cavity lined with epithelium and filled with liquid or semisolid matter. There are many varieties of cysts occurring in different parts of the body. See dermoid cyst, fimbrial cyst, hydatid, ovarian cyst, retention cyst, sebaceous cyst.
2. a dormant stage produced during the life cycle of certain protozoan parasites of the alimentary canal, including Giardia and Entamoeba.
3. a structure formed by and surrounding the larvae of certain parasitic worms.
1. an abnormal sac or closed cavity lined with epithelium and filled with liquid or semisolid matter. There are many varieties of cysts occurring in different parts of the body. See dermoid cyst, fimbrial cyst, hydatid, ovarian cyst, retention cyst, sebaceous cyst.
2. a dormant stage produced during the life cycle of certain protozoan parasites of the alimentary canal, including Giardia and Entamoeba.
3. a structure formed by and surrounding the larvae of certain parasitic worms.
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