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| nerve tissue of the brain and spinal cord that contains fibers and nerve cell bodies and is a dark reddish-gray color |
| a large, triangular muscle covering the joint of the shoulder, the action of which raises the arm away from the side of the body |
bladder blad·der (blād'ər)
n.
Any of various distensible membranous sacs, such as the urinary bladder, that serve as receptacles for fluid or gas.
A blister, pustule, or cyst filled with fluid or air; vesicle.
bladder (blād'ər) Pronunciation Key
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A stretchable saclike structure in the body that holds fluids. The term is used most often to refer to the urinary bladder, which is part of the excretory system. Another kind of bladder is the gallbladder.