n. 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.adj. Of or pertaining to the earth; existing on the earth; earthly.adj. Representing, or consisting of, the earth.adj. Of or pertaining to the world, or to the present state; sublunary; mundane.adj. Consisting of land, in distinction from water; belonging to, or inhabiting, the land or ground, in distinction from trees, water, or the like.adj. Adapted for the observation of objects on land and on the earth.n. An inhabitant of the earth.