An instrument or device designed to measure brain function, size, activity, or other properties of brain tissue.
From Latin cerebrum (brain) + Greek metron (measure). This compound follows the standard pattern of scientific instruments ending in -meter.
While 'cerebrometer' is a logical term for brain-measuring devices, modern scientists use specific equipment names like 'fMRI' (functional magnetic resonance imaging) and 'EEG' (electroencephalography), which tells you exactly how they measure versus just 'measuring the brain.'
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