[ ˌdʌɪnə(ʊ)'fladʒəleɪt ]
■ noun Biology a single-celled aquatic organism with two flagella, occurring in large numbers in marine plankton. [Division Dinophyta.]
Origin
C19 (as adjective): from mod. L. Dinoflagellata , from Gk dinos 'whirling' + L. flagellum (see flagellum ).