The Collaborative International Dictionary of English v.0.48:

Terrestrial \Ter*res"tri*al\, a. [L. terrestris, from terra the
   earth. See Terrace.]
   1. Of or pertaining to the earth; existing on the earth;
      earthly; as, terrestrial animals. "Bodies terrestrial."
      --1 Cor. xv. 40.
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   2. Representing, or consisting of, the earth; as, a
      terrestrial globe. "The dark terrestrial ball." --Addison.
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   3. Of or pertaining to the world, or to the present state;
      sublunary; mundane.
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            Vain labors of terrestrial wit.       --Spenser.
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            A genius bright and base,
            Of towering talents, and terrestrial aims. --Young.
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   4. Consisting of land, in distinction from water; belonging
      to, or inhabiting, the land or ground, in distinction from
      trees, water, or the like; as, terrestrial serpents.
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            The terrestrial parts of the globe.   --Woodward.
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   5. Adapted for the observation of objects on land and on the
      earth; as, a terrestrial telescope, in distinction from an
      astronomical telescope.
      [1913 Webster] -- Ter*res"tri*al*ly, adv. --
      Ter*res"tri*al*ness, n.
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WordNet (r) 3.0 (2006):

terrestrially
    adv 1: in a worldly manner; "terrestrially changeable" [syn:
           mundanely, terrestrially]
    2: to a land environment; "terrestrially adapted"