Definition of anti- in English:

anti-

(also ant-)

prefix

1Opposed to; against: anti-aircraft
1.1Preventing: antibacterial
1.2Relieving: antipruritic
1.3The opposite of: anticlimax
1.4Acting as a rival: antipope
1.5Unlike the conventional form: anti-hero
2 Physics The antiparticle of a specified particle: antiproton

Origin

from Greek anti 'against'.

Definition of anti- in:

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Word of the day guzzle
Pronunciation: ˈgʌz(ə)l
verb
eat or drink (something) greedily