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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| heterosis (ˌhɛtəˈrəʊsɪs) | |
| —n | |
| biology another name for hybrid vigour | |
| [C19: from Late Greek: alteration, from Greek heteroioun to alter, from heteros other, different] | |