Webster's Revised Unabridged Dictionary · 1913

Hydatid

Hydatid , noun

[Greek {not transcribed}, {not transcribed}, a watery vesicle under the upper eyelid, from "y`dwr, "y`datos, water: compare French hydatide.]

(Zoology) A membranous sac or bladder filled with a pellucid fluid, found in various parts of the bodies of animals, but unconnected with the tissues. It is usually formed by parasitic worms, esp. by larval tapeworms, as Echinococcus and Conurus. See these words in the Vocabulary.
Collocations (1)
Hydatid of Morgagni (Anatomy) , one of the small pedunculated bodies found between the testicle and the head of the epididymis, and supposed to be a remnant of the Mullerian duct.