pope

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Roman Catholic Church The bishop of Rome and head of the Roman Catholic Church.
• noun Eastern Orthodox Church The patriarch of Alexandria.
• noun The Coptic patriarch of Alexandria.
• noun The male head of some non-Christian religions.
• noun A person considered to have unquestioned authority.

from The Century Dictionary.

• noun The Bishop of Rome as head of the Roman Catholic Church and hierarchy.
• noun The patriarch of Alexandria.
• noun A priest in the Greek or Russian Church.
• noun The head of any church or ecclesiastical system.
• noun The blacktail, a fish: same as ruff.
• noun The bullfinch.
• noun The red-backed shrike, Lanius collurio.
• noun The puffin, Fratercula arctica. Montagu.
• noun The painted finch, or nonpareil. See cut under Passcrina.

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

• noun obsolete Any ecclesiastic, esp. a bishop.
• noun The bishop of Rome, the head of the Roman Catholic Church. See Note under Cardinal.
• noun A parish priest, or a chaplain, of the Greek Church.
• noun (Zoöl.) A fish; the ruff.
• noun a game at cards played on a round board with compartments.
• noun the gland surrounded with fat in the middle of the thigh of an ox or sheep.
• noun the rump, or uropygium, of a bird. See Uropygium.
• noun to adhere more stringently to Roman Catholic practices and doctrine than is required by church doctrine; -- usually used in a negative sense to mean, to be excessively pious.

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

• noun Christianity The bishop of Rome; the head of the Roman Catholic church.
• noun by extension The head of any religion.
• noun The Bishop or Patriarch of Alexandria.
• noun A small Eurasian freshwater fish, Gymnocephalus cernua.
• noun Any of various birds having reddish plumage on the breast, especially the bullfinch.
• noun An Eastern Orthodox priest.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the head of the Roman Catholic Church
• noun English poet and satirist (1688-1744)