Incubate is the strange Latin word, and it's a verb -- of course, as we know-- it's a verb typically used with relation not to spirits but to gestating birds, and it literally means "to brood."

incubabat“是个罕见的拉丁词，是个动词--当然，我们知道--这个动词通常用于正在孕育后代的鸟,而不用于神灵，它的字面意思是“孵“

耶鲁公开课 - 弥尔顿课程节选