- A membranous anatomic structure, usually dense, irregular, collagenous connective tissue, which envelops an organ, a joint, or any other part resembling a capsule or envelope.
- A fibrous tissue layer enveloping an organ or a tumor, especially if benign.
- A solid dosage form in which a drug is enclosed in a hard or soft soluble container or “shell” of a suitable form of gelatin.
- A hyaline polysaccharide coating around a fungal or bacterial cell. Bacteria may also have a polypeptide capsule or a slime layer around the cell.
[L. capsula, dim. of capsa, box]