| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
dementia de·men·tia (dĭ-měn'shə)
n.
Deterioration of intellectual faculties, such as memory, concentration, and judgment, resulting from an organic disease or a disorder of the brain, and often accompanied by emotional disturbance and personality changes.
| dementia (dĭ-měn'shə) Pronunciation Key
Deterioration of intellectual faculties, such as memory, concentration, and judgment, sometimes accompanied by emotional disturbance and personality changes. Dementia is caused by organic damage to the brain (as in alzheimer's disease), head trauma, metabolic disorders, or the presence of a tumor. |