spirulina
Concise Oxford English Dictionary © 2008 Oxford University Press:
spirulina /ˌspɪrʊˈlʌɪnə, ˌspʌɪrʊ-/
▶noun a filamentous cyanobacterium of a genus typically forming tangled masses in warm alkaline lakes. [Genus Spirulina.]
– origin mod. L., from spirula ‘small spiral (shell)’.
'spirulina' also found in these Oxford entries:

