n.
A person who holds controversial opinions, especially one who publicly dissents from the officially accepted dogma of the Roman Catholic Church.
adj.
Heretical.
[Middle English heretik, from Old French heretique, from Late Latin haereticus, from Greek hairetikos, able to choose, factious, from hairetos, chosen, from haireisthai, to choose. See heresy.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.