capsule

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capsule (kaps-yool) n.
1. a membrane, sheath, or other structure that encloses a tissue or organ. joint c. the fibrous tissue, including the synovial membrane, that surrounds a freely movable joint.

2. a soluble case, usually made of gelatin, in which certain drugs are administered.

3. the slimy substance that forms a protective layer around certain bacteria.

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