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burner the part of a furnace, water heater, stove, or other appliance that emits heat or flame. [1/2 definitions]
covariance in statistics, a measure of how two variables are related, equal to the product of the deviation of each variable from its mean. In positive covariance, the two variables (such as temperature and air conditioner use) are directly related and follow the same trend. In negative covariance, the two variables (such as temperature and heater use) are inversely related and follow opposite trends.
defroster a small heater, usu. in a car, for preventing or removing frost.