Centrales

plural noun
Cen·tra·les | \ sen‧ˈtrā(ˌ)lēz \

Definition of Centrales 

: an order of diatoms having cylindrical disklike or even-angular cells always lacking a raphe or pseudoraphe and having radial markings and often spines — compare pennales

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History and Etymology for Centrales

New Latin, from Latin centrum center + New Latin -ales

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