adjective  also: pneumatical (njʊˈmætɪkəl)1. of or concerned with air, gases, or wind
  Compare hydraulic 2. (of a machine or device) operated by compressed air or by a vacuum
 a pneumatic drill
 pneumatic brakes
 3. containing compressed air
 a pneumatic tyre
  4. of or concerned with pneumatics
 5.  theologya. of or relating to the soul or spirit
 b. of or relating to the Holy Ghost or other spiritual beings
  6. (of the bones of birds) containing air spaces which reduce their weight as an adaptation to flying
 7.  informal (of a woman) well rounded, esp with a large bosom
  noun8.   short for pneumatic tyre
 Word origin
C17: from Late Latin 
pneumaticus of air or wind, from Greek 
pneumatikos of air or breath, from 
pneuma