the GNU version of the Collaborative International Dictionary of English
n. An instrument for measuring the intensity of heat radiating from a fire, or the cooling influence of bodies. It is a differential thermometer, having one bulb coated with gold or silver leaf.
The Century Dictionary and Cyclopedia
n. An instrument for measuring the intensity of radiating heat or cold.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a pyrometer that uses the color of the light emitted by a hot object