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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a fool or simpleton; ninny. |
| diastole (daɪˈæstəlɪ) | |
| —n | |
| Compare systole the dilatation of the chambers of the heart that follows each contraction, during which they refill with blood | |
| [C16: via Late Latin from Greek: an expansion, from diastellein to expand, from | |
| diastolic | |
| —adj | |
| diastole (dī-ās'tə-lē) Pronunciation Key
The period during the normal beating of the heart in which the chambers of the heart dilate and fill with blood. Diastole of the atria occurs before diastole of the ventricles. Compare systole. diastolic adjective (dī'ə-stŏl'ĭk) |