Webster's English Dictionary

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pneumatic

pneu.mat.ic \n(y)u.-'mat-ik\ \-i-k(*-)le-\ aj [L pneumaticus, fr. Gk 
   pneumatikos, fr. pneumat-, pneumaX air, breath, spirit, fr. pnein to 
   breathe - more at SNEEZE 1: of, relating to, or using air, wind, or other 
   gas :  1a: moved or worked by air pressure  1b1: adapted for holding or 
   inflated with compressed air  1b2: having air-filled cavities  2: SPIRITUAL 
    - pneu.mat.i.cal.ly av