lablabPronunciation: /ˈlablab/Definition of lablab noun [mass noun] an Asian plant of the pea family, which is widely grown in the tropics for its edible seeds and pods and as a fodder crop. Lablab purpureus, family Leguminosae Origin: early 19th century: from Arabic lablāblablab in other Oxford dictionaries Definition of lablab in the US English dictionary