gallbladder -
Alternative spelling of gall bladder.
Wikipedia
the gallbladder (cholecyst, gall bladder) is a small organ that aids digestion and stores bile produced by the liver. In humans the loss of the gallbladder is usually easily tolerated.
OmegaWiki Dictionary
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gallbladder Pear-shaped organ that stores bile, releasing it when the body needs it for digestion.