nounpl.suc·cu·bus·es or suc·cu·bi(-bīˌ, -bēˌ) also suc·cu·bae(-bēˌ, -bīˌ)
A female demon supposed to descend upon and have sexual intercourse with a man while he sleeps.
An evil spirit; a demon.
Origin: Middle English, from Medieval Latin, alteration (influenced by Late Latin incubus, incubus) of Latin succuba, paramour, from succubāre, to lie under : sub-, sub- + cubāre, to lie down.
