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
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Human echinococcosis, also known as hydatidosis or hydatid disease, is caused by the larval stages of the tapeworm.
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Rebecca Kreston, Discover Magazine, 29 Apr. 2014
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Rebecca Kreston, Discover Magazine, 29 Apr. 2014
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“Hydatid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydatid. Accessed 30 Oct. 2025.
Copy CitationMedical 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
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