Having air cavities.

To fill with air cavities

Third-person singular simple present indicative form of pneumatize

(obsolete, organic chemistry) Any salt or ester of pneumic acid

present participle of pneumatize

That produces pneumatization

spiritualism centred on the belief in the pneuma

plural of pneumate

Any device which generates or is powered by compressed air

(anatomy) Any bone, such as the mastoid process or those of the birds, that contains many hollow cells full of air