elodea Syllabification: (e·lo·de·a)Pronunciation: /iˈlōdēə/Definition of elodea noun an aquatic plant of a genus that includes the ornamental waterweeds. Genus Elodea, family Hydrocharitaceae Origin:modern Latin, from Greek helōdēs 'marshy'elodea in other Oxford dictionaries Definition of elodea in the British & World English dictionary