[pen.nate] adj [irreg. fr. NL Pennales] (1938): of, relating to, or being diatoms of an order (Pennales) usu. characterized by a raphe or a structure resembling a raphe and by ornamentation of the valves that is bilaterally symmetrical
PENNATE
Meaning of PENNATE in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012