Akademik

pennales

\\pəˈnā(ˌ)lēz\ noun plural

Usage: capitalized

Etymology: New Latin, from Latin penna feather + New Latin -ales

: an order of diatoms having a raphe or pseudoraphe and ornamentation of the valves always bilaterally arranged in relation to a line rather than to a point — compare centrales

Useful english dictionary. 2012.