| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
schema sche·ma (skē'mə)
n. pl. sche·mas or sche·ma·ta (skē-mä'tə, skĭ-māt'ə)
A diagrammatic representation; an outline or a model.
A pattern imposed on complex reality or experience to assist in explaining it, mediate perception, or guide response.