- 1 a small container that has a measured amount of a medicine inside and dissolves when you swallow it The medicine can be taken in tablet or capsule form. Take two 100 mg capsules a day.
- 2a small plastic container with a substance or liquid inside
- 3 the part of a spacecraft in which people travel and that often separates from the main rocket the cramped conditions of a space capsule
- 4(technology) a shell or container for seeds or eggs in some plants and animals see also time capsule