an instrument that measures depth, especially used in water or underground exploration.
From 'depth' plus '-meter' (from Greek 'metron' meaning measure). Compound words ending in '-meter' are common in scientific terminology for measuring devices.
The '-meter' suffix gives us a whole family of measuring tools—speedometer, thermometer, barometer—and a depthometer does for depth what these do for their respective properties, opening up the underwater world to precise measurement!
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