PYXIDIUM Meaning of PYXIDIUM in English n. (pl. pyxidia) Bot. a seed-capsule with a top that comes off like the lid of a box. [ mod.L f. Gk puxidion, dimin. of puxis: see PYXIS ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012