incubous / incubus [ˈɪŋkjəbəs]
incubous – adj. – 1. of leaves, arranged so that the anterior margin or each overlaps the posterior margin of the next younger; 2. having such leaves; contrast succubous – leaves arranged so that the posterior margin of each overlaps the anterior margin of the next older
incubus – n. – 1. a male demon believed to have sexual intercourse with sleeping women; 2. a nightmare; 3. a person or thing that oppresses or troubles like a nightmare