Cite
 

Meaning of cosmonautics

cos•mo•nau•tics

Pronunciation: (koz"mu-nô'tiks, -not'iks), [key]
— n. (used with a sing. v.)
  1. astronautics, esp. as applied to space flight.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.