Definition of hydatid in English:



  • 1A cyst containing watery fluid, in particular one formed by and containing a tapeworm larva.

    as modifier ‘a hydatid cyst’
    • ‘However, a developing hydatid cyst up to 5 cm in diameter may not show scolices as they appear about 1 year after infestation.’
    • ‘One of the biggest problems with curing hydatids is that it may go undetected in the body for many years.’
    • ‘Definitive diagnosis is made by identifying the hydatid cyst that is usually first detected by radiologic studies.’
    • ‘On chest radiography, the hydatid cysts were found to be bilateral in two patients.’
    • ‘Most hydatid cysts develop in the liver, and most of them are asymptomatic at the time of diagnosis.’
    1. 1.1 A tapeworm larva.


Late 17th century: from modern Latin hydatis, from Greek hudatis, hudatid- ‘watery vesicle’, from hudōr, hudat- ‘water’.