Hygrographs

Part of speech: noun

Definitions

1. An instrument used to measure and record humidity levels over time
2. a device that translates changes in moisture into a graphical representation
3. a tool employed in meteorology to provide data on atmospheric moisture variations

Etymology: "Hygrographs" is the plural of "hygrograph," an instrument that continuously records changes in atmospheric humidity as a trace on paper, much as a barograph does for air pressure. The plural form simply means several such instruments, typically the ones stationed at different weather sites. The word is built from two Greek-derived elements. "Hygro-" comes from Greek "hygros," meaning wet or moist, and "-graph" comes from Greek "graphein," meaning to write or draw. Together they describe a device that writes down wetness, which is exactly what the instrument does: a pen traces a line showing how humidity rises and falls over time.