| 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. |
convection (kənˈvɛkʃən) ![]() | |
| —n | |
| 1. | Compare conduction a process of heat transfer through a gas or liquid by bulk motion of hotter material into a cooler region |
| 2. | meteorol the process by which masses of relatively warm air are raised into the atmosphere, often cooling and forming clouds, with compensatory downward movements of cooler air |
| 3. | geology the slow circulation of subcrustal material, thought to be the mechanism by which tectonic plates are moved |
| [C19: from Late Latin convectiō a bringing together, from Latin convehere to bring together, gather, from vehere to bear, carry] | |
| con'vectional | |
| —adj | |
| con'vective | |
| —adj | |