blackcoat

from The Century Dictionary.

• noun One who wears a black coat: a common and familiar name for a clergyman, as redcoat is, in England, for a soldier.
• noun plural A name given to the German reiters, or mercenary troops, in the sixteenth and seventeenth centuries, from their black armor and dress.

from the GNU version of the Collaborative International Dictionary of English.

• noun A clergyman; -- familiarly so called, as a soldier is sometimes called a redcoat or a bluecoat.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A member of the clergy.