PNEUMO- Meaning of PNEUMO- in English ■ combining form1》 relating to the lungs: pneumogastric.2》 relating to the presence of air or gas: pneumothorax. Originsense 1 from Gk pneumōn 'lung'; sense 2 from Gk pneuma 'air'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004