Polemic
POLEM'IC
POLEM'ICAL, adjective [Gr. war.]
1. Controversial; disputative; intended to maintain an opinion or system in opposition to others; as a polemic treatise, discourse, essay or book; polemic divinity.
2. Engaged in supporting an opinion or system by controversy; as a polemic writer.
POLEM'IC, noun A disputant; a controvertist; one who writes in support of an opinion or system in opposition to another.