anti

against, opposite

Spelled anti · anti 'against, opposite'

Greek anti meant against: an antidote works against poison, antiseptic blocks infection, and an antithesis places one idea against another.

Words built from it

antidote — a remedy that counteracts a poison or harm
anti- (against) + dote (given, from Greek dotos)
antiseptic — preventing infection by stopping germ growth
anti- (against) + sept (rot, infection, from septikos)
antibiotic — a substance that fights bacterial life
anti- (against) + biotic (living, from bios 'life')
antisocial — unwilling or hostile toward social contact
anti- (against) + social (of society)
antipathy — a deep-seated feeling of dislike
anti- (against) + path (feeling)
antithesis — the direct opposite of something
anti- (against) + thesis (a placing, position)

anticipate — from Latin ante- 'before' plus capere 'to take,' a different prefix from Greek anti- 'against' that only looks similar