hydatid noun. ['hʌɪdǝtɪd] L17.
[mod. Latin hydatid-, hydatis from Greek hudatid-, -is drop of water, watery vesicle, from hudat-, hudōr water: see -ID².]
Orig., a cyst containing watery fluid. Now, a fluid-filled cyst or a jelly-filled cluster of cysts produced by and containing a larva of the tapeworms Echinococcus granulosus or E. multilocularis, and occurring in dogs, sheep, etc., whence it is caught by humans; a tapeworm so encysted. Freq. attrib.

Comb.:
hydatid disease: caused by a hydatid, with very variable symptoms and effects.

■ hyda'tidiform adjective having the form of a hydatid;

■ hydatidiform mole, (the condition of having) a cluster of fluid-filled vesicles in the womb as a result of the degeneration of chorionic tissue during pregnancy: M19.

■ hydati'dosis noun hydatid disease E20.

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