Cholecyst
The gallbladder.
The word cholecyst is not much used today but it figures into a number of other terms to do with the gallbladder Cholecystectomy is removal of the gallbladder.
Cholecystitis is inflammation of the gallbladder.
Cholecystogram is an x-ray of the gallbladder.
Cholecyst, literally, means, bilebladder.
It comes from chol, referring to bile + cyst, a bladder.