terrestrial \terres"trial\, 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.
      1913 webster

   2. representing, or consisting of, the earth; as, a
      terrestrial globe. "the dark terrestrial ball." --addison.
      1913 webster

   3. of or pertaining to the world, or to the present state;
      sublunary; mundane.
      1913 webster

            vain labors of terrestrial wit.       --spenser.
      1913 webster

            a genius bright and base,
            of towering talents, and terrestrial aims. --young.
      1913 webster

   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.
      1913 webster

            the terrestrial parts of the globe.   --woodward.
      1913 webster

   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 -- terres"trially, adv. --
      terres"trialness, n.
      1913 webster
see also:
terrace terres"trially terres"trialness 

terrestrial \terres"trial\, n.
   an inhabitant of the earth.
   1913 webster

eyepiece \eye"piece`\ eye-piece \eye"-piece`\, n. opt.
   the lens, or combination of lenses, at the eye end of a
   microscope, telescope or other optical instrument, through
   which the image formed by the mirror or object glass is
   viewed.

   syn: ocular.
        1913 webster

   collimating eyepiece. see under collimate.

   negative, or huyghenian, eyepiece, an eyepiece
      consisting of two plano-convex lenses with their curved
      surfaces turned toward the object glass, and separated
      from each other by about half the sum of their focal
      distances, the image viewed by the eye being formed
      between the two lenses. it was devised by huyghens, who
      applied it to the telescope. campani applied it to the
      microscope, whence it is sometimes called campani's
      eyepiece.

   positive eyepiece, an eyepiece consisting of two
      plano-convex lenses placed with their curved surfaces
      toward each other, and separated by a distance somewhat
      less than the focal distance of the one nearest eye, the
      image of the object viewed being beyond both lenses; --
      called also, from the name of the inventor, ramsden's
      eyepiece.

   terrestrial, or erecting eyepiece, an eyepiece used in
      telescopes for viewing terrestrial objects, consisting of
      three, or usually four, lenses, so arranged as to present
      the image of the object viewed in an erect position.
      1913 webster
see also:
collimating eyepiece collimate negative huyghenian eyepiece campani's eyepiece 
positive eyepiece ramsden's eyepiece terrestrial erecting eyepiece 

terrestrial
     adj 1: of or relating to or inhabiting the land as opposed to the
            sea or air syn: tellurian, telluric, terrene
     2: of or relating to or characteristic of the planet earth or
        its inhabitants; "planetary rumblings and eructations"-
        l.c.eiseley ; "the planetary tilt"; "this terrestrial
        ball" syn: planetary
     3: operating or living or growing on land syn: landa
        ant: amphibious, aquatic
     4: concerned with the world or worldly matters; "mundane
        affairs"; "he developed an immense terrestrial
        practicality" syn: mundane
     5: of this earth; "transcendental motives for sublunary
        actions"; "fleeting sublunary pleasures"; "the nearest to
        an angelic being that treads this terrestrial ball" syn:
        sublunar, sublunary
see also:
tellurian telluric terrene planetary landa amphibious 
aquatic mundane sublunar sublunary 

76 moby thesaurus words for "terrestrial":
   cynthian, philistine, anagalactic, asteroidal, astral, astrologic,
   astrologistic, astrologous, astronomic, astrophysical, carnal,
   carnal-minded, celestial, circumplanetary, cislunar, earth,
   earthbound, earthling, earthly, earthy, empyreal, empyrean,
   equinoctial, extragalactic, fluvioterrestrial, galactic,
   geophilous, global, heavenly, heliacal, human, intercosmic,
   interplanetary, intersidereal, interstellar, lunar, lunary, lunate,
   lunular, lunulate, material, materialistic, meteoric, meteoritic,
   mortal, mundane, nebular, nebulose, nebulous, planetal,
   planetarian, planetary, planetesimal, profane, prosaic, secular,
   semilunar, sidereal, solar, sphery, star-spangled, star-studded,
   starry, stellar, stellary, subastral, sublunar, tellurian,
   telluric, temporal, terraqueous, terrene, unspiritual, uranic,
   worldly, zodiacal