Air present between the cranium and the dura mater; the term is commonly used to indicate extradural or subdural air. ... Origin: G. Pneuma, air, + kranion, skull ... (05 Mar 2000) ... 
Type: Term Pronunciation: nū′mō-krā′nē-ŭm Definitions: 1. Air present between the cranium and the dura mater; the term is commonly used to indicate extradural or subdural air.