Main Entry: in·cu·bus

Pronunciation: \ˈiŋ-kyə-bəs, ˈin-\

Function: noun

Inflected Form(s): plural in·cu·bi \-ˌbī, -ˌbē\ also in·cu·bus·es

Etymology: Middle English, from Late Latin, from Latin incubare

Date: 13th century

1 : an evil spirit that lies on persons in their sleep; especially : one that has sexual intercourse with women while they are sleeping — compare succubus
2 : nightmare 2
3 : one that oppresses or burdens like a nightmare