Describing a type of barometer or gauge that measures air pressure without using liquid.
From 'an-' (without) combined with French 'éroïde' or Greek 'aeros' (air) and the suffix '-oid' meaning 'resembling.' The name describes how it works without fluid, unlike traditional mercury barometers.
The aneroid barometer was a revolutionary invention in the 1840s because it finally let sailors and explorers measure air pressure without carrying fragile tubes of mercury that would spill in rough weather.
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