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| 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. |
sickle cell sick·le cell (sĭk'əl)
n.
An abnormal, crescent-shaped red blood cell that results from a single change in the amino acid sequence of the cell's hemoglobin, which causes the cell to contort, especially under low-oxygen conditions. Also called drepanocyte, meniscocyte.