Capsules

noun

1. A membranous envelope.
2. A type of simple, dehiscent, dry fruit (seed-case) produced by many species of flowering plants, such as poppy, lily, orchid, willow and cotton.
3. A sporangium, especially in bryophytes.
4. A tough, fibrous layer surrounding an organ such as the kidney or liver
5. A membrane that surrounds the eyeball