|the offspring of a zebra and a donkey.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
xerosis xe·ro·sis (zĭ-rō'sĭs)
n. pl. xe·ro·ses (-sēz)
Abnormal dryness, especially of the skin, eyes, or mucous membranes.
The normal hardening of aging tissue.