incubus
Cross references: 1. succubus in.cu.bus \'in-ky*-b*s, 'in-\ \-.bi--, -.be-\ n or in.cu.bi also in.cu.bus.es [ME, fr. LL, fr. L incubare] pl 1: an evil spirit supposed to lie upon persons in their sleep and esp. to h ave sexual intercourse with women by night 2: NIGHTMARE 3: a person or thing that oppresses or burdens like a nightmare