A small radio-transmitting device designed to be swallowed or inserted internally to measure body conditions and transmit data externally.
From 'endo-' (within) + 'radio-' (relating to radio waves) + 'sonde' (from French, a measuring device). This term emerged in medical technology in the mid-20th century as wireless capsules became feasible.
Endoradiosondes are the ancestors of modern pill cameras doctors use to examine your digestive system—essentially a spy capsule you swallow that sends pictures back while traveling through your body!
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