Etymology
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terrestrial (adj.)

late 14c., "of or pertaining to the earth," with + -al (1) + from Latin terrestris "earthly, of the earth, on land," from terra "earth" (from PIE root *ters- "to dry"). Originally opposed to celestial; natural history sense of "living on land" is attested from 1630s. The noun meaning "a human being, a mortal" is recorded from 1590s.

updated on May 13, 2017

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Definitions of terrestrial from WordNet

terrestrial (adj.)
of or relating to or inhabiting the land as opposed to the sea or air;
Synonyms: tellurian / telluric / terrene
terrestrial (adj.)
of or relating to or characteristic of the planet Earth or its inhabitants; "planetary rumblings and eructations"- L.C.Eiseley;
this terrestrial ball
Synonyms: planetary
terrestrial (adj.)
operating or living or growing on land;
terrestrial (adj.)
concerned with the world or worldly matters;
he developed an immense terrestrial practicality
Synonyms: mundane
terrestrial (adj.)
of this earth;
the nearest to an angelic being that treads this terrestrial ball
Synonyms: sublunar / sublunary
From wordnet.princeton.edu, not affiliated with etymonline.