hydathode Syllabification: (hy·da·thode)Pronunciation: /ˈhīdəˌTHōd/Definition of hydathode noun Botany a modified pore, especially on a leaf, that exudes drops of water. Origin: late 19th century: from Greek hudōr, hudat- 'water' + hodos 'way'hydathode in other Oxford dictionaries Definition of hydathode in the British & World English dictionary