hydatid

hy·da·tid

noun \ˈhīd-ə-təd, -ˌtid\

Definition of HYDATID

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 1

2

a : an abnormal cyst or cystic structure; especially : hydatidiform mole b : hydatid disease