Definition of "hydatid" [hy•da•tid]

• A cyst formed as a result of infestation by larvae of the tapeworm Echinococcus granulosus. (noun)
• The encysted larva of E. granulosus. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The resulting infection in man is known as hydatid disease and is very hard to treat."
• "In searching, he had recalled another, rarer case: one of a hydatid cyst in the subcutaneous tissue of the thigh."
• "She has been extensively examined, and we have found that she suffered from a range of diseases including sand pneumoconiosis, a hydatid cyst in the lung, strongyloides and schistosomiasis (both parasitic diseases), and arthritis."