Gallbladder (noun)

1. A small pear-shaped sac located under the liver that stores and concentrates bile, releases it into the small intestine via the common bile duct when needed for the digestion of fats.
2. A small sac in some animals, such as the shark, that stores bile.

Origin:

Early 17th century: gall + bladder.

Examples:

1. The patient had to have his gallbladder removed because of gallstones.
2. The gallbladder releases bile into the small intestine.
3. The gallbladder is a small organ located under the liver.
4. The gallbladder plays an important role in the digestion of fats.
5. The shark's gallbladder stores bile which is used to digest food.