n. pl. in·cu·bus·es or in·cu·bi (-bī′) 1. An evil spirit supposed to descend upon and have sexual intercourse with women as they sleep. 2. A nightmare. 3. An oppressive or nightmarish burden. [Middle English, from Late Latin, alteration of Latin incubō, from incubāre, to lie down on; see INCUBATE.] |
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