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"
例句
He accepted the imperial crown from the Roman people instead of from the pope (1328) and backed the appointment of an antipope. 后来他从罗马人民手中而不是从教宗那里接受了帝国皇冠(1328),并支持伪教宗的任命。