- Original: ῥέω - Transliteration: Rheo - Phonetic: hreh'-o - Definition: 1. to flow - Origin: a primary verb - TDNT entry: None - Part(s) of speech: Verb - Strong's: A primary verb; for some tenses of which a prolonged form (ῥεύω rheuō) is used; to flow (run as water): - flow.