A visual recording or graph of thunder and its characteristics, such as sound intensity and duration, made by scientific instruments.
From Greek 'bronte' (thunder) + '-gram' (something written or recorded). The '-gram' suffix became standard in the 1800s for scientific recordings and measurements.
A brontogram is like a fingerprint of a thunderstorm—just as each lightning strike has unique characteristics, each brontogram shows the unique 'signature' of that particular thunder's sound waves.
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