Synonym for ethmoid air cells ... The numerous small air-filled cells of the ethmoidal labyrinth. ... See: anterior ethmoidal air cells, middle ethmoidal air cells, posterior ethmoidal air cells. ... Synonym: cellulae ethmoidales, sinus ethmoidales, ethmoidal cells. ... (05 Mar 2000) ... Found on http://www.encyclo.co.uk/local/20973