Siphonales

plural noun
Si·phon·ales | \sīfəˈnā(ˌ)lēz\

Definition of Siphonales 

: an order of marine and freshwater green algae (class Chlorophyceae) whose filaments consist essentially of a large multinucleate cell with cross walls rare and usually only adjacent to reproductive organs — compare codium , siphonocladales

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History and Etymology for Siphonales

New Latin, from siphon- + -ales

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