The development of air cells such as those of the mastoid and ethmoidal bones. ... Origin: G. Pneuma, air ... (05 Mar 2000) ... 
(noo″mә-tĭ-za´shәn) the formation of air cavities in tissue, especially such formation in the temporal bone.
Type: Term Pronunciation: nū′mă-ti-zā′shŭn Definitions: 1. The development of air cells such as those of the mastoid and ethmoidal bones.