[ba.sid.i.um] n, pl -ia [NL, fr. L basis] (1859): a structure on the fruiting body of a basidiomycete in which karyogamy occurs followed by meiosis to form usu. four basidiospores
BASIDIUM
Meaning of BASIDIUM in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012