An instrument or device designed to show the direction and force of the wind, similar to a weathervane or anemometer.
From Greek anemos (wind) plus scope (to view or observe), literally 'wind-viewer.' This technical term describes instruments for observing wind patterns.
The anemoscope is an ancestor of modern weather instruments—before digital sensors and satellites, weather observers would literally just look at these devices to predict storms and changes in conditions, which is why wind observation became a central part of meteorology!
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