plural noun
Gym·​no·​din·​i·​a·​les | \-ā(ˌ)lēz\

Definition of Gymnodiniales 

: an order of greenish brown algae (class Dinophyceae) having no cell wall but often a firm periplast that is longitudinally striated and comprising the naked dinoflagellates — compare peridiniales

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History and Etymology for Gymnodiniales

New Latin, from Gymnodinium + -ales

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living or existing for a long time

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