[py.gid.i.um] n, pl -ia [NL, fr. Gk pygidion, dim. of pyge rump] (ca. 1849): a caudal structure or the terminal body region of various invertebrates -- py.gid.i.al adj
PYGIDIUM
Meaning of PYGIDIUM in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012