watercressPronunciation: /ˈwɔːtəkrɛs/Translate watercress | into French | into German | into Italian | into Spanish Definition of watercress noun [mass noun] a Eurasian cress which grows in running water and whose pungent leaves are used in salad. Rorippa nasturtium-aquaticum, family Cruciferae watercress in other Oxford dictionaries Definition of watercress in the US English dictionary