1. a cyst with watery contents that is produced in humans and animals by a tapeworm in the larval state; cysticerus.
  2. a cystic vestige of an embryonic feature.
  1. Also hy·da·tid·i·nous. of or relating to a hydatid.
  2. containing or affected by hydatids.

Origin of hydatid

1675–85; < Greek hydatid- (stem of hydatís) watery vesicle
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of hydatid

British Dictionary definitions for hydatid


  1. a large bladder containing encysted larvae of the tapeworm Echinococcus: causes serious disease in man
  2. Also called: hydatid cyst a sterile fluid-filled cyst produced in man and animals during infestation by Echinococcus larval forms

Word Origin for hydatid

C17: from Greek hudatis watery vesicle, from hudōr, hudat- water
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

hydatid in Medicine


  1. A hydatid cyst.
  2. The encysted larva of Echinococcus granulosus.
  3. An abnormal vascular structure that is usually filled with fluid.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.