phreatophytePronunciation: /frɪˈatəfʌɪt/Definition of phreatophyte noun Botany a plant with a deep root system that draws its water supply from near the water table. Derivatives phreatophytic adjective Origin: 1920s: from Greek phrear, phreat- 'a well' + -phytephreatophyte in other Oxford dictionaries Definition of phreatophyte in the US English dictionary