spirulinaPronunciation: /ˌspɪrʊˈlʌɪnə, ˌspʌɪrʊ-/Definition of spirulina noun [mass noun] filamentous cyanobacteria which form tangled masses in warm alkaline lakes in Africa and Central and South America. Genus Spirulina, division Cyanobacteria (usually Spirulina) spirulina cyanobacteria dried and prepared as a food or food additive, being a rich source of many vitamins and minerals. Origin:modern Latin, from spirula 'small spiral (shell)'spirulina in other Oxford dictionaries Definition of spirulina in the US English dictionary