Consisting of, or resembling, air; having the properties of an elastic fluid; gaseous; opposed to dense or solid.
- Of or relating to air or other gases.
- Of or relating to pneumatics.
- Run by or using compressed air: a pneumatic drill.
- Filled with air, especially compressed air: a pneumatic tire.
- Zoology Having cavities filled with air, as the bones of certain birds.
- Of or relating to the pneuma; spiritual.