hygrographs
/ˈhaɪɡrəˌɡræfs/
noun
- Instruments that automatically record or graph the amount of moisture (humidity) in the air over time.
- The weather station uses hygrographs to track daily humidity changes.
- Scientists checked the hygrographs to see if the air was getting drier.
- Old hygrographs used a pen on a rotating drum to draw the moisture levels.
Synonyms