[ul.tra.struc.ture] n (1939): biological structure and esp. fine structure (as of a cell) not visible through an ordinary microscope -- ul.tra.struc.tur.al adj -- ul.tra.struc.tur.al.ly adv
ULTRASTRUCTURE
Meaning of ULTRASTRUCTURE in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012