hydatid
noun
hy·da·tid ˈhī-də-təd 
-ˌtid
: the larval cyst of a tapeworm (genus Echinococcus) occurring as a fluid-filled sac containing daughter cysts in which scolices develop
Word History
Etymology
Greek hydatid-, hydatis watery cyst, from hydat-, hydōr
First Known Use
1683, in the meaning defined above
Medical Definition
hydatid
noun
hy·da·tid ˈhīd-ə-təd, -ˌtid
1
: 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 sense 12
a
: an abnormal cyst or cystic structure
especially : hydatidiform mole
b
: hydatid disease
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