Definition of superterrestrial in US English:

superterrestrial

adjective

  • 1Existing or dwelling in a region above or beyond the earth; belonging to a more exalted world or sphere.

  • 2= superterranean.

Origin

Mid 17th century; earliest use found in Thomas Bedford (d. 1653), Church of England clergyman and author. From super- + terrestrial. Compare post-classical Latin superterrestris.