Pathology| 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. |
| 3. | Also, hy⋅da⋅tid⋅i⋅nous. of or pertaining to a hydatid. |
| 4. | containing or affected by hydatids. |

hydatid hy·da·tid (hī'də-tĭd)
n.
A hydatid cyst.
The encysted larva of Echinococcus granulosus.
An abnormal vascular structure that is usually filled with fluid.