hyacinth bean Syllabification: (hy·a·cinth bean)Entry from US DictionaryDefinition of hyacinth bean noun a tropical Asian plant of the pea family, widely grown as an ornamental or for its edible seeds and pods and as a fodder crop. Lablab purpureus (or Dolichos lablab), family Leguminosae hyacinth bean in other Oxford dictionaries Definition of hyacinth bean in the US English dictionary