succubi

‖n.; pl. Succubae [ NL., fr. L. succubare to lie under; sub under + cubare to lie down; cf. L. succuba, succubo, one who lies under another. ] A female demon or fiend. See Succubus. [ 1913 Webster ]

Though seeming in shape a woman natural
Was a fiend of the kind that succubae some call. Mir. for Mag. [ 1913 Webster ]