cosmonautics

[koz-muh-naw-tiks, -not-iks]

noun (used with a singular verb)

astronautics, especially as applied to space flight.

Origin of cosmonautics

First recorded in 1945–50; see origin at cosmonaut, -ics
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019