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Medical Dictionary


noun hy·da·tid \ˈhīd-ə-təd, -ˌtid\

Medical Definition of HYDATID

:  the larval cyst of a tapeworm of the genus Echinococcus that usually occurs as a fluid-filled sac containing daughter cysts in which scolices develop but that occasionally forms a proliferating spongy mass which actively metastasizes in the host's tissues—called also hydatid cyst; see echinococcus 1
a :  an abnormal cyst or cystic structure; especially :  hydatidiform mole b :  hydatid disease
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