The Collaborative International Dictionary
Pneumaticity
Pneumaticity \Pneu`ma*tic"i*ty\, n. (Biol.) The state of being pneumatic, or of having a cavity or cavities filled with air; as, the pneumaticity of the bones of birds.
Wiktionary
pneumaticity
n. (context biology English) The state of being pneumatic, or of having a cavity or cavities filled with air.