plural noun
Si·pho·noc·la·da·les | \ˌsīfəˌnäkləˈdā(ˌ)lēz\

Definition of Siphonocladales 

: an order of green algae (class Chlorophyceae) originally including all multinucleate members of the class capable of vegetative division but now usually restricted to those that are apparently derived from the Siphonales and are nonseptate when young (as in the families Valoniaceae and Dasycladaceae)

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History and Etymology for Siphonocladales

New Latin, from Siphonocladus, type genus (from siphon- + Greek klados branch, sprout) + -ales

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