dwimor, n.n: an illusion, delusion, apparition; phantom. (“dwih-mor”)
Image from British Library Medieval Manuscripts blog: Detail of an historiated initial ‘D'(ilexi) with a woman (Duchess Dionora?) with a skull for a face admiring herself in a hand mirror, with ‘Memento homo’ in a roundel at the left, at the beginning of the Office of the Dead, from a Book of Hours (‘The Hours of Dionara of Urbino’), central Italy (Florence or Mantua), c. 1480. British Library, MS Yates Thompson 7, f. 174r.