The Collaborative International Dictionary of English v.0.48:

Aerognosy \A`["e]r*og"no*sy\, n. [A["e]ro- + Gr. ? knowing,
   knowledge: cf. F. a['e]rognosie.]
   The science which treats of the properties of the air, and of
   the part it plays in nature. --Craig.
   [1913 Webster]