| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a chattering or flighty, light-headed person. |
| thermostat (thûr'mə-stāt') Pronunciation Key
A device that automatically controls heating or cooling equipment in such a way as to maintain a temperature at a constant level or within a specified range, generally using a thermometer capable of triggering electrical switches that activate or deactivate the equipment. |
A device that monitors and automatically responds to changes in temperature and activates switches controlling devices such as furnaces or air conditioners.