A small, sealed, pressurized cabin with an internal environment that will support human or animal life during extremely high-altitude flight, space flight, or escape.

A membranous structure enclosing a body part or organ.

A closed structure bearing seeds or spores; it is dehiscent at maturity.

A boxlike component or unit, often sealed.

A thick, mucous envelope, composed of polypeptide or carbohydrate, surrounding certain microorganisms.

A soluble shell in which drugs are enclosed for oral administration.