-cap·nia
\ˈkapnēə\  noun combining form 
(plural -capni·as \-nēəz\ ; or -capni·ae \-nēˌē\) 
Etymology: New Latin, from Greek kapnos smoke + New Latin -ia; akin to Latin cupere to desire — more at covet 
 : carbon dioxide in the blood 
< hypercapnia >
< hypocapnia >
< hypercapnia >
< hypocapnia >