A device or mechanism with two vanes or blade-like parts.
From Latin 'bi-' (two) + 'vane' (a blade or weathervane), from Old English 'fane' (a flag). The term is technical, used in machinery and wind instruments.
Bivanes appear in anemometers and other weather instruments—two vanes spinning give scientists more accurate wind speed readings than a single vane could! Double-vane designs are more stable and responsive.
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