ANTIPOPE
antipope
(noun) someone who is elected pope in opposition to another person who is held to be canonically elected; “the antipopes resided in Avignon during the Great Schism”
Source: WordNet® 3.1
Etymology
Noun
antipope (plural antipopes)
(Christianity) A person who claims or claimed to be the pope, usually as the result of a disputed election or deposition, but is not considered by the Roman Catholic Church to be the real pope.
Coordinate terms
• antibishop
• pseudocardinal
Source: Wiktionary
An"ti*pope, n.
Definition: One who is elected, or claims to be, pope in opposition to the
pope canonically chosen; esp. applied to those popes who resided at
Avignon during the Great Schism.
Source: Webster’s Unabridged Dictionary 1913 Edition