ρέμα

Etymology: From Ancient Greek ῥεῦμα (rheûma, 'flow, stream, current'), derived from the verb ῥέω (rhéō, 'to flow'). The word shares the same Indo-European root (*srew-) with English words like 'stream' and 'rheum'. The semantic evolution from 'flowing water' to both 'small stream' and 'ravine formed by water' shows how geography and water features are interconnected in Greek landscape terminology.