anti-

 
Pronunciation: /ˈanti/
(also ant-)

prefix

  • 1opposed to; against: anti-aircraft
  • preventing: antibacterial
  • relieving: antipruritic
  • the opposite of: anticlimax
  • acting as a rival: antipope
  • unlike the conventional form: anti-hero
  • 2 Physics the antiparticle of a specified particle: antiproton

Origin:

from Greek anti 'against'