plural noun
Dic·​ty·​o·​siphonales | \ˌdiktēə+\

Definition of Dictyosiphonales 

: an order of brown algae having a profusely branched cylindrical sporophyte which at maturity is differentiated internally into two or three regions

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History and Etymology for Dictyosiphonales

New Latin, from Dictyosiphon + -ales

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living or existing for a long time

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