Adinida

A suborder of dinoflagellates, in which the flagella are free and do not lie in furrows. [G. a- priv. + dien, a whirling]

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Adin·i·da ə-'din-ə-də n pl a suborder of primitive flagellate protozoans of the order Dinoflagellata having two flagella but lacking a transverse groove

adin·i·dan -dən adj or n