Gymnodiniales

plural noun

Gym·​no·​din·​i·​a·​les

-ā(ˌ)lēz

: 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

Word History

Etymology

New Latin, from Gymnodinium + -ales

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