Plural of anemometer; instruments that measure wind speed and sometimes direction.
From Greek 'anemo-' (wind) + '-meter' (measuring instrument). The device was invented in the 1600s, though the modern three-cup design became standard in the 1800s.
The classic cup anemometer looks simple, but its design is brilliant—it exploits wind resistance to spin at a rate proportional to wind speed. Thousands now spin atop weather stations worldwide.
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