“bulb thermometer”

The following 2 entries include the term bulb thermometer.

dry-bulb thermometer

noun

: a thermometer that uses a bulb filled with liquid (such as mercury or alcohol) to register a reading of the temperature of the atmosphere based on the known expansion rate of the liquid : a thermometer that measures dry-bulb temperature

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wet-bulb thermometer

noun

: the thermometer with moistened bulb in a psychrometer

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