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Definition of: incubus
(in′kyə·bəs, ing′-) noun plural ·bus·es or ·bi (-bī)
1. Anything that tends to weigh down or discourage.
2. A nightmare.
3. A demon supposed to descend upon sleeping persons with whom it sought to have sexual intercourse. Compare SUCCUBUS. See synonyms under LOAD. [<Med. L, a demon that causes nightmare <LL, nightmare <L incubare lie on]
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