a cyst containing watery fluid and the larvae of certain tapeworms (esp. genus Echinococcus), found in the body tissue, esp. the liver, of many animals
Origin of hydatidClassical Greek hydatis (gen. hydatidos), watery vesicle ; from base of hydōr, water
of or like such a cyst
- A cyst formed as a result of infestation by larvae of an echinococcus tapeworm.
- The encysted larva of such a tapeworm.
Origin of hydatidGreek hudatis, hudatid-, watery vesicle, from hudōr, hudat-, water; see wed-1 in Indo-European roots.