tapiocaPronunciation: /ˌtapɪˈəʊkə/Definition of tapioca noun [mass noun] a starchy substance in the form of hard white grains, obtained from cassava and used in cookery for puddings and other dishes. Origin: early 18th century: from Tupi-Guarani tipioca, from tipi 'dregs' + og, ok 'squeeze out'tapioca in other Oxford dictionaries Definition of tapioca in the US English dictionary