polemic
Concise Oxford English Dictionary © 2008 Oxford University Press:
polemic /pəˈlɛmɪk/
▶noun a strong verbal or written attack.
■ (also polemics) the art or practice of engaging in controversial debate or dispute.
▶adjective (also polemical) of or involving strong or controversial debate.– derivatives
polemically adverb,
polemicist noun,
polemicize (or polemicise) verb.
polemically adverb,
polemicist noun,
polemicize (or polemicise) verb.
– origin C17: via med. L. from Gk polemikos, from polemos ‘war’.
'polemic' also found in these Oxford entries:

