| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| Creutzfeldt-Jakob disease (kroits'fělt-yä'kôp) Pronunciation Key
A rare, usually fatal encephalopathy that occurs most often in middle age and is likely caused by a prion. It is characterized by progressive dementia and gradual loss of muscle control. The disease is named after its discoverers, German pathologist Hans Gerhard Creutzfeldt (1885-1964) and German neurologist Alfons Maria Jakob (1884-1931). |