Small individual drops of water that fall from clouds as rain.
From Old English 'regn' (rain, with roots in Proto-Germanic) combined with 'drop' from Middle Dutch 'droppe'. Both parts are ancient, combining to literally mean a drop of rain.
Raindrops aren't actually tear-drop shaped like we draw them—they're more like tiny hamburger buns because air pressure flattens them as they fall, and only giant raindrops (from tropical storms) get that flat-bottom shape.
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