noun

• Any of several species of small, mostly European rodents of the family Gliridae; also called Myoxidae or Muscardinidae by some taxonomists.
• Glis glis, the edible dormouse
• (UK) Muscardinus avellanarius, the hazel dormouse.
• (figuratively) A person who sleeps a great deal, or who falls asleep readily (by analogy with the sound hibernation of the dormouse).